Lit Review · GPT-5.5

Studies in urban planning and public policy have made urban housing affordability a main focus as the disparity between urban household incomes and the cost of urban housing has grown. As cities continue to grow, the demand for housing located in metropolitan areas, where employment, education, and other social services are located, has grown as well. This has caused rents and housing prices to rise, outpacing wage increases. The result has been a growing affordability crisis for lower and middle income households. Housing affordability encompasses more than just the housing market; it raises issues of social equity and justice, as well as the sustainability of urban areas. Housing affordability literature has focused on the relationship between the cost of housing and the income of a household. Affordability is determined when a household spends more than a defined proportion (often 30%) of their income on housing. This proportion has been widely criticized for affording a simplistic view of affordability. Other factors, such as the size of a household, the cost of transportation, the location of housing, the quality of housing, and the services available, have all been criticized for lack of consideration. More recently, affordable housing has been considered in relation to a household's livelihood, the distance a household has to travel to other employment, the services and the conditions of the neighborhoods where a household lives, as well as the security of tenure. A major focus of literature is on the structural reasons for the increasing unaffordability of housing. Some of the structural causes identified by researchers are: limited land supply, rigid zoning, speculative securities, financialization of housing, changing demographics, and insufficient supply of affordable housing. In a lot of global cities, housing has become an investment asset class, thus creating a situation where housing is a competitive market, resulting in central housing displacement of lower-income residents. Simultaneously, public housing has decreased while market-oriented housing has failed to meet the needs of low-income households. There is a related body of literature on the consequences of a housing system where affordability is increasingly lacking. These include the financial distress of being housed at a high cost, tradeoffs in spending on health and education, overhousing, and an increased risk of homelessness. From a spatial perspective, the unaffordability of housing creates the financial distress of living in high-cost housing located on the urban fringe, which is further away from employment and services. This situation creates a socially interested and economically segregated urban area. The literature reviews a wide range of policies to address affordability, including rent controls, inclusionary zoning, housing subsidies, public and social housing, land use reform, and Transit-Oriented Development. While these policies are discussed widely, there are ongoing debates about the tradeoffs and unintended consequences of these policies. This review aims to analyze the existing literature on urban housing affordability to understand how the term 'affordability' is defined, what the underlying causes of afforability problems are, and what policies are most commonly proposed to address them.

The problem of affordability in urban housing has become a central issue in modern urban studies, planning and public policy, and is part of a rising concern that incomes are failing to keep pace with the cost of providing adequate housing in cities. With the continued growth of urban populations, demand for well-located housing has grown even stronger, especially in metropolitan areas where jobs, educational facilities, transportation and social services are concentrated. This demand has led to increasing rent and house prices, sometimes outstripping wage increases, and putting pressure on low and middle income households. This means that access to housing is not just about the market, but is also a matter of social equity, spatial justice and urban sustainability. Historically, housing affordability has been studied in terms of the affordability of housing costs to the household income available. Affordability is typically measured by a variety of common measures including the housing-cost-to-income ratio, meaning households that spend more than a certain percentage (usually 30 percent) of their income on housing are considered to be unaffordable. Although this is still a very common model, it has been criticized for its failure to account for differences in household size, transportation expenses, location of a household, housing quality, and services available. Recent work takes a more multi-dimensional view, recognising that the question of affordable housing must be considered in the context of the availability of livelihood opportunities, commuting costs, neighbourhood context and residential security. One of the key topics in the literature is the structural causes of the decline in affordability. Several factors have been pointed out by researchers, among them land scarcity, zoning regulations that limit where housing can be built, speculative housing investments, financialization of housing, demographic change, and inadequate production of affordable housing. Housing has increasingly become an investment asset, rather than a space for living, in many global cities, leading to a growing competition and displacement of low-income residents from central and well connected neighbourhoods. Meanwhile, there has been a reduction in the provision of public housing in many settings and in some instances, the development of the market has failed to keep up with the requirements of low income households. A second body of research analyzes the effects of housing inaffordability. The cost of housing can lead to financial strain on the household budget, decrease spending on health and education, lead to overcrowding and increase the likelihood of experiencing homelessness. Spatially, the pressures of affordability can drive people to the outer fringes of a community, increasing the distance they must travel to work and to public facilities and services. Such results contribute to socio-economic segregation and to the lack of inclusiveness of urban development. The housing policy measures that have been proposed in the literature are rent control, inclusionary zoning, housing subsidies, public and social housing investments, land-use reform, and transit-oriented development. But there is still discussion about their effectiveness, scalability and side effects. This review attempts to summarize current research on urban housing affordability, including definitions of housing affordability, the causes of housing affordability problems, and the policy options that are generally suggested to alleviate affordability issues.

In recent years, urban housing affordability has been at the forefront of urban studies, urban planning, and public policy agendas because of the increasing difference between the level of household income and the costs associated with securing adequate accommodation in cities. Urbanization has continued to grow, increasing the demand for well-located housing in particularly urban areas characterizing higher density of jobs, educational facilities, transport systems, and other services; hence, increased rents and housing prices surpassing wage increases causing severe problems for the lower and middle-income group of society. Therefore, housing affordability is also a social question associated with social justice and urban sustainability, not only with the industry. Most of the literature on housing affordability traditionally examines the relationship between the costs of housing and the household income level. Typically, the housing-cost-to-income ratio is used for this purpose, meaning that affordable housing can be defined as spending a specific percentage (usually around 30%) of household income on housing. However, although this model is widely used, it oversimplifies housing affordability because other characteristics such as household size, transport costs, housing quality, neighborhood features, and access to services are not considered. Therefore, recently, more scholars voice their opinion about the necessity to develop a multidimensional approach to the notion of housing affordability, indicating that affordable housing is to be considered in relation to the available opportunities for different households. Another essential direction of literature emphasizes the structural reasons of declining housing affordability. Different factors contributing to declining housing affordability can be defined by demographic changes, land scarcity, lack of affordable housing construction, financialization of housing, being turned into an asset, zoning regulations, and speculations in land and housing development. In urban centers, housing is increasingly recognized as an investment rather than a place to live in, which creates competition among the residents and displaces lower-income groups of society. At the same time, the quantity of public housing has decreased in many countries where the problem of financialization of housing intensified. The fifth strand of literature reviews the impact of high housing costs on local residents. It has been proved that high housing prices do not only create financial burden for households, but they may cause overdoses of stress because of the increase of costs on housing. Such situations, in turn, lead to poor health-care because less money can be spent for health and education; overcrowding occurs, and people become homeless. Moreover, such financial stress creates the movement of people from cities as they may be forced to move to the suburbs, experiencing longer commutes and ultimately becoming citizens of economically segregated communities. Policy options discussed in the literature include rent control, social and public housing investments, housing subsidies, zoning regulations, etc. Although debates on the effectiveness and scalability of such policies continue, their impact remains unquestionable; therefore, this work seeks to define how housing affordability should be defined, to determine what drives housing affordability problems, and to outline the ways of tackling the problems with affordability.

The issue of urban housing affordability has become a major subject for researchers in urban studies, urban planners and for the public policies, because there is a growing gap between the prices to be paid for a decent and adequate housing and the income of households. In terms of numbers, the population of cities is increasing continuously and therefore the demand for good housing, located near employment, education, transport and health services, is increasing, thus putting pressure on prices and on the rental income in relation to the wages. The issue of affordability of housing becomes therefore a matter of social equity, of spatial justice and of sustainability of the city. Other studies approach the topic of housing affordability from a more conceptual angle. They question the generally applied and very simple index of the housing-cost-to-income ratio (mostly capped at 30%) and insist that to define and to measure housing affordability other variables have to be taken into account, e.g. the size of the household, other expenditure related to the use of housing, costs of transport to places of work and study, the neighborhood in which a house is located and its infrastructure and services, the quality of the housing stock, long-term security of tenures, and more. From this broadened perspective, in addition to financial means for housing also other factors of affordability are to be taken into account for the livelihoods of households. A broad range of factors are implicated as the drivers of declining housing affordability. In addition to established factors such as restricted land supply and excessive planning controls, housing speculation, the financialization of housing, changes in household demographics and demand for housing are increasingly being recognized. In many cities around the world, increasingly, housing is being converted to an asset class, securing high returns for investors. Rather than providing shelter for occupants, the increasing value of housing is seen to push out lower-income households from sought-after locations in the city center and along transport corridors. The supply of quality, affordable housing from public housing and not-for-profit providers has generally declined in recent decades. The market is unable to consistently provide the quantity of affordable housing required to service households on low incomes. Another important area of research on unaffordable housing examines the consequences for individuals and families of high and increasing housing costs. The consequences for household finances, health and education expenditure, crowding and homelessness have been addressed in various studies. The spatial implications for individuals, in terms of increased commuting and decreased access to employment, services and facilities have also been a focus of research, highlighting the issues for equity and justice that unaffordable housing presents for urban sustainability. Policies to address unaffordable housing have included rent control, inclusionary zoning, subsidized housing, social housing, and reform of land use and transport policies. However, there is continued debate about the effectiveness and the advantages and disadvantages of many of these policies. In this review we discuss how affordability has been defined in the literature, the main factors which determine affordability, and the policy measures which have been proposed in order to tackle the problem of unaffordable housing in urban areas.

Affordability of urban housing has become a core theme in modern urban studies, planning, and public policy. Urbanization and growth of city populations mean that the number of people looking for appropriate urban housing has been rising dramatically over the last decades, which, in turn, has resulted in a growing cost of housing. It is especially relevant for urban areas where all necessary services are available, including work, education, transport links, etc. In other words, there is a need to discuss issues related to affordability of urban housing and to analyze the main findings in this area. First of all, it should be noted that, according to common practice, housing affordability implies the ratio of income and expenses of a particular household on rent or mortgage payment. Traditionally, scholars use the housing-cost-to-income ratio as the criterion of housing affordability, when households whose expenditures are more than 30 percent of income are considered as those who experience affordability problems. Despite being popular and widely used, such measures are under criticism as being too simple and unable to consider all peculiarities of affordability, such as different sizes of households, travel expenses, location, housing quality, accessibility to services and facilities, etc. One of the main topics addressed by researchers in the sphere of urban housing affordability is related to factors contributing to housing affordability decline. In particular, scientists identify a number of factors affecting it: land shortage, restrictive land use policies, speculation and financialization of housing, demographic shifts, lack of housing units' construction, and others. For instance, in many big cities around the world, housing has become an asset rather than merely place to live in; therefore, competition has increased, and low-income households are forced to leave good areas. At the same time, there has been observed a reduction of affordable housing provided by municipalities and governments while private housing does not meet requirements of such households. Also, there is research addressing negative consequences of unaffordability of housing. The higher price of housing results in higher expenses of households and can lead to greater financial strain on families, which means that they spend less money on health care and education, overcrowding of housing occurs, and there are more cases of homelessness. Spatially, this leads to displacement of low-income families to suburban areas and makes them face longer commuting, less access to services, etc. Finally, in relation to policy-making, there is a discussion of various instruments aimed at addressing housing affordability problem, including rent controls, inclusionary zoning, subsidies, public and social housing investment, land use changes, transit-oriented developments, etc. However, there are doubts regarding their efficiency and possible side-effects. The current paper is dedicated to the overview of the scholarly literature on urban housing affordability with focus on its definition, driving forces, and policy instruments.

Affordable housing has been identified as one of the defining challenges facing cities today. Although an adequate place to live is a fundamental human need and right, many low- and middle-income urban households cannot access adequate housing within their financial means. Across the world, people are struggling to keep up with rising rents and house prices, while wages remain stagnant. Ensuring affordable access to adequate housing is therefore increasingly understood not only as a matter of access to the private market but also as a broader question of social and spatial justice and urban sustainability. In this Research Topic, we invited researchers to share their studies of urban housing affordability. Specifically, we asked them to address how affordability is defined; what factors contribute to affordability problems; and which policies can best address affordability challenges. Here we provide a brief overview of existing literature on these questions. Conceptualizations of housing affordability Perhaps the most fundamental issue in research on affordable housing is how affordability is defined. Traditional affordability scholarship has been concerned with the relationship between housing expenses and income. To date, most studies operationalize affordability as a function of housing expenses; that is, whether or not a household pays more than x% of its income on housing (usually 30 percent is used as the benchmark). While this calculation is still widely used, researchers have highlighted how this definition of affordability is too narrow. Definitions of affordable housing have been expanded to include other important factors such as household size, transportation costs, location, and accessibility, housing quality, neighborhood characteristics, and access to services. Some have argued that affordable housing should be considered in the context of livelihood opportunities, commute times, housing conditions, and long-term residential stability. Drivers of affordable housing While there is no consensus on how to define affordable housing, researchers have drawn broad agreement on what factors have caused it to decline. Limited supply of land and restrictive land use regulations, along with speculation and financialization in the housing market have made housing unaffordable for low- and middle-income households. In many cities around the world, housing is increasingly viewed as an asset for investment rather than as a place to live, exacerbating housing affordability problems. Globalization and population growth have also been cited as drivers of housing unaffordability. In addition, the production of housing that is affordable to low- and middle-income households has not kept pace with increasing demand. In some places, public housing construction has dwindled. In other contexts, market-based housing development has occurred, but households that cannot afford to pay market rates have been left without options. Effects of unaffordable housing While a growing body of research is dedicated to understanding what drives affordable housing problems, other scholars have examined the effects of unaffordable housing on households and cities. High housing costs can lead to financial stress, housing insecurity, cut backs in spending on healthcare and education, overcrowding, and homelessness. Unaffordability can also cause people to live farther from employment centers and public transportation, which limits access to jobs and opportunity. Together, these consequences create distinct patterns of socio-economic segregation. Policies to address unaffordable housing While researchers tend to agree that unaffordability is a growing problem with severe consequences, there is less consensus on what can be done about it. Common solutions put forth in the academic literature and popular discussions include rent control, inclusionary zoning, housing vouchers, investments in public and social housing, land-use reforms, and transit-oriented development. However, there is disagreement about the effectiveness of each of these solutions. Some have even noted that certain policies, such as rent control, can have undesirable side effects.

Housing affordability Housing affordability is a critical theme in the academic literature on urban studies and planning. The literature revolves around three key aspects of housing affordability; the causes of unaffordable housing, the consequences, and the potential policy interventions for affordable housing. Traditionally, a household was categorized as being unable to afford housing when they used more than 30 percent of its earnings on housing costs. However, recent scholarship has critiqued this approach of measuring housing affordability and argued for broader measures that consider not just income but also household size, transportation costs, housing quality and neighborhood amenities. Unaffordable housing is attributed to a wide variety of factors; high housing prices and/or rents that increase at a higher rate than household earnings, lack of affordable housing for low-income households, and the financialization of housing. It is argued that in global cities housing is not just a space of dwelling but also an asset that generates financial returns for the investor. This has increased the financial importance of residential assets. As a result, the real estate sector has become increasingly intertwined with finance and housing has become a vehicle for investment and speculation. It is therefore argued that high house prices and/or rents are largely driven by speculation, financialization, land constraints, housing finance and restrictive zoning regulations. The commercial sector is said to under-supply units that lower-income households can afford and public housing options have also declined due to reduced spending on public housing. This has resulted in housing affordability problems being felt keenly by low and middle-income households. Several studies point out the serious cost-of-living implications that high house prices and rents can have on low-income households. When facing unaffordable housing, households may be compelled to divert scarce resources from essential items, like education and health care to housing costs, or settle for smaller and more crowded housing units or become homeless. Rising housing costs in central cities have resulted in poor households being displaced to peripheries with long commuting times. Such housing outcomes have been said to exacerbate social exclusion and lead to socio-economic segregation. Affordable housing is thus seen as more of a broader equity issue not just of accessibility to housing but also the accessibility of affordable housing close to livelihood opportunities, with necessary social infrastructure, and adequate transport connections. Several policy interventions that have been adopted to deal with these challenges include rent control, direct subsidies, inclusionary housing, spending on public housing, reform of regulatory policies like zoning and implementing transit-oriented developments. Much literature evaluates the effectiveness of these policies as well as questioning whether they can be scaled up without leading to negative unintended effects.

Urban housing affordability is a primary topic of urban study, planning and policy today due to growing disconnect between households income and the costs associated with an acceptable city life. The cities are developing and expanding, attracting increasing demand not only for the city job centres but also as residences as we have seen the same for the location of the major sources of information and services and public transit centres in metropolitan areas of the cities worldwide. This growing demand increases house rents and prices at rates faster than the growth of income leading to the inability for the low- and moderate-income households to be able to be situated in an accessible area. Housing affordability is a key concern relating to the markets for housing and social inequalities and accessibility issue. It is important from the perspective of urban development which can either make or break. In general, scholars of housing have approached housing affordability simply, examining housing costs and household incomes. Traditionally, scholars have discussed how affordable the housing must be for a family in relation to its earnings. The housing-cost-to-income ratio measures the share of a family's earnings spent on housing to some standard benchmark, commonly a portion of the earnings- say $2000 per month by a working-age family, who uses over thirty percent of earnings as house costs. However, scholars have critiqued that this simplistic framing limits any understanding of housing's affordability by ignoring issues concerning the household sizes, transport cost, location, housing quality, availability of public amenities. Many studies have also looked at the multidimensional nature of affordabililty related to livelihoods, cost of transportation, neighbourhood quality and length of stay. The key topic has in part concentrated on the structural processes behind deteriorating housing prices. They mention factors like limited availability of land and regulations restricting its use like the zoning ordinances; speculative buying of property in the city, financialization of the housing market; change in demographic structures like changing family sizes and a mismatch between income and rent prices, as well as lack of the production of housing units at varied price range to fill various income levels needs. In many countries and cities the housing supply has progressively become financial asset rather than a resident's place, thus raising competition between the buyers for the space, pushing higher-income city residents further to move towards peripheries, hence they are at greater risk of displacement. Furthermore public housing construction has also stagnated compared to other development sectors. In contrast, developments driven by Market could not often afford housing at a range suitable for low- income households that would fulfill the residential housing demand across all household segment of income at that particular city location. Furthermore, there is a body of literature dealing with consequence of unaffordability to social group as it causes the household financial stress and cutback spending on their education or healthcare, overcrowded living situation, and the increase risk of homelessness. Spatial and mobility implications include being pushed to more peripheral housing location resulting in longer commute times and decreasing access to employment centres and public transit, whichreinforces the socio-economic segregation within cities and negatively hinders urban regeneration and inclusivity. Rent regulation or rent control, inclusionary zoning, inclusion of publicly and socially-owned and operated housing, housing assistance (subsidies) for lower-income households, and transport-Oriented-Development are among some measures to curb housing affordability crisis mentioned in the scholarly literature; however the effectiveness and scaling up possibilities, as well as unintended consequences of proposed solutions need more research attention. This review examines present scholarship on urban housing affordability including defining what affordability means, drivers behind such issue and policy alternatives commonly prescribed to them.

Urban housing affordability — the growing gap between household incomes and what it costs to secure adequate urban accommodation, for ownership or renting — has become a focus of much contemporary urban studies, planning and public policy. Well-located housing unit demand has risen as urban population growth continues, especially in metropolitan areas concentrated with employment, education, transportation and social services. House prices and rents are continuing to climb because of this demand — usually outpacing wage growth, while piling pressure on struggling low- and middle-income households. Affordable housing is thus not simply an issue of the affordability of access to markets but a more deep problem about wider issues that include social equity, spatial justice and urban sustainability. Housing affordability research has traditionally focused on the association between housing costs and household income. Affordability is most commonly defined by common measures such as the housing-cost-to-income ratio, which comprises whether households pay more than a specific proportion‐generally 30 percent of their income− for housing. Although this methodology is still commonplace, researchers have criticized it for its simplification of affordability by assuming peripheral households are the same as those in more well-off boroughs while omitting discrepancies around household size, transport costs, distance to community services etc. Recent scholarship has taken a multidimensional approach, suggesting that affordable housing needs to be understood with respect to income opportunities or large commuting burdens, local neighborhoods and chronic vs. permanent residential security [16]. A prominent theme in the literature addresses structural factors behind falling affordability. Researchers point to a plethora of contributing factors: scarcity, zoning inhibition, speculative investment and financialisation, demographic change (e.g. In numerous cities worldwide, housing has increasingly functioned as an investment rather than simply a home to live in — driving competition and the expulsion of low-income renters from central and well-connected neighborhoods. Simultaneously, the supply of public housing has fallen in many contexts and market-led development have mainly catered to higher income households with no relation to effective demand by net. A third important line of scholarship investigates housing unafforability impacts. Housing in the context of stress: High housing costs contribute to household financial pressure and reduced spending on health and education; overcrowding increases, homelessness risk rises. Spatially, affordability pressures could push residents to the suburbs and beyond—longer commutes translating into longer travel times for work and poorer access to other amenities. Such outcomes strengthen patterns of socio-economic segregation and undermine inclusive urban development. The literature discusses policy responses including rent regulation, inclusionary zoning, housing subsidies and public- and social-housing investment as well land-use reform planning reforms or combining transit-oriented development. Yet for these interventions, there is still controversy regarding impact & scalability and side effects. This review explores the scholarship around urban housing affordability, investigating from definitions of affordability and underlying causes to the mitigation strategies recommended by policy scholars.

In recent years, one of the main areas of focus in urban studies, planning and public policy is housing affordability, typically referred to as urban housing affordability. In simple terms, it refers to the mismatch between household incomes and the costs of renting or purchasing adequate housing or shelter in cities. Growing urban populations have increased the demand for well-located housing, especially in cities where jobs, education, transport, and social services are concentrated. The demand has been contributing to rising rents and house prices more than ever, outpacing the increase of wages and putting pressures on low- and middle-income families. As a result, housing affordability is not merely an issue of market access but also one of social equity, spatial justice and urban sustainability. Academic literature on affordability has primarily focused on the correlation between housing costs and household income. The most common measure of affordability is the housing-cost-to-income ratio, which defines affordability as whether households spend more than a specified proportion, often 30 percent, of their income on housing. Many scholars have criticized the continued use of this measure however arguing that it simplifies affordability by ignoring differences between households in size, transport, location, and quality of housing and access to services. According to new studies, housing affordability should be related to livelihood opportunities, commuting costs, neighbourhood conditions, and durable residential security. A principal theme in the literature concerns the structural drivers of declining affordability. Researchers identify a number of contributors, such as limited land, zoning restrictions, speculative investing, financialisation of housing, demographic change and inadequate affordable production. In many global cities, housing is becoming an increasingly important investment asset rather than just a place to live. This can create stiffer competition and the displacement of lower-income people from central and well-connected neighborhoods. In many contexts, the provision of public housing had also declined; while development led by the market also often failed to meet the needs of low-income households. Another important set of scholarship investigates the impact of housing unaffordability. The financial burden placed on households increases due to high housing costs. Spending on health, education, and other necessities will see a dip due to this. This will also lead to overcrowding and greater risk of homelessness. As affordability pressures push residents to more peripheral areas, they experience longer commutes with reduced access to employment and public services. Such impacts are repeated experiences of segregation and distortion of urban development. Responses to the policy presented in the literature include regulating rents, inclusionary zoning, housing subsidy, investing in public and social housing, reforming land-use, and mainland transit-oriented development. Yet, people keep debating about the altering effectiveness, the scale, and the consequences. This review of the literature on urban housing affordability discusses how affordability is defined, what drives it, and what the most common responses are.

While there exists considerable knowledge about the impact of climate-related hazards on both the built environment and the economy, very little attention has been paid to the effects of extreme weather events on people's physical activity levels. The purpose of this study was to determine the extent to which the frequency and severity of extreme weather events (hurricanes) affect the level of physical activity among older adults. The results indicated that hurricane frequency had no significant effect upon the amount of walking or bicycling done by respondents; however, as hurricanes became stronger, respondents reported significantly less bicycle riding, running/jogging/walking and/or other forms of physical activity. Overall, the data suggest that increased frequency and strength of hurricanes negatively impacts older adult engagement in regular physical activities. Thus, there appears to be a need for researchers to examine additional environmental stressors related to natural disasters. In conclusion, extreme weather events do appear to negatively impact older adults' levels of participation in regular physical activities. Therefore, older adults who live in areas prone to extreme weather events should be encouraged to take action to mitigate some potential negative effects of severe storms. Specifically, older adults living in coastal areas that experience frequent hurricanes could prepare themselves by engaging in physical exercise before the onset of each hurricane season. Additionally, older adults could engage in physical activity during the storm itself to help maintain cardiovascular function, blood flow, circulation, muscle tone, balance and flexibility. Older adults who are able to walk outdoors during a hurricane would likely benefit from doing so since walking provides numerous benefits for individuals exposed to high winds and heavy rain. Older adults who are unable to physically leave their homes during a hurricane may wish to consider indoor-based exercises like yoga, stretching, etc. Finally, if possible, older adults could relocate temporarily to non-coastal regions that typically do not experience frequent severe weather events. This relocation strategy would provide older adults with a safe opportunity to engage regularly in various types of physical activities. In summary, while there is currently a lack of scientific evidence regarding the specific effects of extreme weather events (e.g., hurricanes) on older adults' levels of engagement in regular physical activities, our study provides preliminary support for this relationship. Furthermore, we believe that future studies examining similar relationships will ultimately lead to better understanding of how older adults cope with extreme weather events.

A focal point of current urban research, planning and policy has been the increasing problem of urban housing affordability, stemming from the growing disparity between incomes of households and the cost of adequate housing in cities. An ever-growing urban population has placed increased demand on well-located housing especially in major metropolitan centres with access to jobs, schools, transit and social services, thus elevating rent and house prices to levels that have often outpaced wages and squeezed the purchasing power of low and middle-income households. Affordability thus is a question of not just market access, but a matter of social equity, spatial justice and urban sustainability.

Urban housing affordability has become a major issue in current discussions on urban studies, planning, and public policy, since there is an ever-widening gap between household incomes and the cost of obtaining sufficient housing in cities. With urban populations still growing, the demand for housing in good locations has increased, especially in metropolitan areas where employment, education, transportation, and social services are located. This increased demand has led to higher rents and house prices, which tend to rise faster than wages and thus place greater strain on low- and middle-income households. Housing affordability is therefore not just a matter of having access to the market but also a wider concern involving social equity, spatial justice, and urban sustainability. Traditional literature on housing affordability has concentrated on the link between housing costs and household income. Measures commonly used in this area, for example the ratio of housing costs to income, determine if a household is considered affordable on the basis of whether it spends more than a certain share—typically 30 percent—of its income on housing. Although this method is still widely applied, scholars have criticised it for oversimplifying the concept of affordability by failing to take into account differences in household size, transportation costs, location, the quality of housing, and access to services. More recent studies have instead taken a multidimensional approach and stressed that affordable housing should be understood in relation to livelihood opportunities, commuting burdens, neighbourhood conditions, and long-term residential security. A key issue in the literature is the role of structural factors in the falling affordability. Scientists point to a number of factors that contribute to this, such as the scarcity of land, strict zoning regulations, speculative investment, the financialization of housing, demographic change, and the lack of production of affordable housing units. In a great many global cities housing has become more and more an investment asset rather than just a place where people live, which has increased competition and led to the displacement of lower-income residents from central and well-served areas. Meanwhile, public housing provision has dropped in a number of cases, and market-driven development has generally not met the needs of households with limited means. A significant area of academic research looks at the effects of housing being unaffordable. Because housing costs are high, households experience greater financial strain, have less money to spend on health and education, end up having to share rooms, and are more likely to face homelessness. In terms of location, the pressure regarding affordability may cause people to move to more remote areas, which in turn results in longer commuting times and poorer access to jobs and public services. Such results strengthen existing patterns of socio-economic segregation and hinder inclusive urban development. The kinds of policy measures mentioned in the literature are rent control, inclusionary zoning, housing subsidies, investment in public and social housing, land-use reform, and transit-oriented development. Yet there is still controversy concerning the effectiveness, scalability, and unintended consequences of these measures. This review looks at the existing academic work on urban housing affordability, with a focus on how affordability is defined, what factors cause affordability problems, and which policy approaches are most frequently suggested as ways of dealing with them.

Cities are running out of affordable places to live, and scholars, planners, and policy‑makers have taken notice. As more people crowd into urban centers, the scramble for housing near jobs, schools, transit, and services has gone into overdrive. Rents and prices keep climbing, often outstripping wage growth and squeezing low‑ and middle‑income families. So the issue isn't just about paying a bill; it's tied up with fairness, where people can live and whether a city can stay livable over the long haul. The classic yardstick? Housing‑cost‑to‑income ratio, often pegged at 30 % of earnings. Simple enough, yet it masks differences in household size, transport bills, local amenities, and dwelling condition. Scholars now argue that a truly affordable home must also line up with work prospects, commute length, neighborhood feel, and long‑term security. Why prices keep soaring? A handful of forces keep tightening the market. Land scarcity and stubborn zoning rules choke new construction. Meanwhile, investors treat apartments like stocks, flipping them for profit and nudging prices higher. And the supply side? Clearly broken. Demographic shifts and the sheer lack of low‑cost units add fuel to the fire. In many world‑class cities, a flat is seen more as a portfolio piece than a roof over heads, which nudges poorer residents out of central, well‑connected neighborhoods. At the same time, public housing projects have withered, while private developers rarely deliver enough for those who can't afford market rates. Sky‑high rents do more than drain wallets; they ripple through daily life. Families may cut back on health care or school fees, and cramped living conditions become common. The risk of ending up on the streets climbs. As costs push people toward the outskirts, commutes stretch and access to jobs or services shrinks, deepening segregation and undercutting inclusive growth. Policymakers have tried everything from rent caps and inclusionary zoning to subsidies, public‑housing builds, land‑use tweaks, and transit‑oriented schemes. Yet debates rage over which tools actually work, how big they can be rolled out, and what side effects they might trigger. This article sweeps through the scholarship, sorting out how scholars define affordability, what they blame for the squeeze, and which policy ideas dominate the conversation.