Lit Review · GPT-5.5

Today, urban studies, public policy and housing economics are increasingly focused on issues of urban housing affordability. Urban centres have become magnets for migration, employment, and investment. With these urban attractants have come high housing costs for urban areas. While the textbook definition of housing affordability is the relation of household income to housing costs, it has been argued that housing affordability includes issues of financing, location, service accessibility, housing quality, secure housing tenure, social participation, and inclusion. Some of the structural drivers of declining urban housing affordability are described in the literature. Linked to the supply-and-demand relationship is the control on the quantity of available land. In high growth urban nodes, restrictive land use regulations and lengthy land use approvals in combination with insufficient land supply create barriers to new housing construction and high housing costs. Investment cycles of global capital and flows of investment capital into real estate have also been argued to serve housing as a social good and transform housing into a financial asset. The combination of housing investor demand, short-term rental markets, and speculative development has intensified competition for housing and displacement pressures in many urban areas. The literature deals with the impact of changing labor markets and increasing income inequality. With stagnant wages for low and middle income earners, housing costs have risen even more. The affordability gap has grown greatly, especially for renters, young adults, migrants, and essential workers, who have greater exposure to rent burdens and have even less opportunity to own homes. These studies show that affordable housing has a close relationship with spatial inequality. Lower cost housing is farther from places of work and public transport, schools, and medical care. Because of this, households choose to have even higher housing costs in order to have lower transportation costs and have better access to opportunities and jobs. There are many different opinions on the best ways to address the lack of urban housing affordability. Reforms to zoning laws along with changes to density and the time it takes to approve new developments are supply side adjustments to housing affordability. Demand side adjustments include housing vouchers and rent subsidies. These can help purchasing power of the households but can increase costs further if the supply of housing remains low. The other adjustments to the housing market include rent controls, inclusionary zoning, and the construction of public housing along with community Land Trusts and taxes on speculative and vacant housing. Lack of urban housing affordability is both a market failure and a social equity issue. Because of this, the focus of affordable housing strategies needs to be on both of these. This review focuses on the main discussions in the literature on housing affordability for the measurement and definition of affordability, the main causes, the social effect of lack of affordability, and policy. By consolidating these discussions, the aim is to understand the mechanisms of affordability in urban economies and politics.

Affordability of urban housing is one of the most important topics discussed in current studies of urban areas, public policies, and housing economics. With continuing urbanization and growth of urban populations in terms of numbers of residents, jobs, investments, and activities, the accessibility of affordable housing becomes an urgent issue. Generally, affordability can be seen as an association between the levels of incomes and housing costs of urban residents. However, recent studies tend to stress that housing affordability is related not only to economics but also to geography, quality, accessibility, security, and inclusiveness of urban dwellings. There are certain structural factors associated with decreasing housing affordability identified by scholars. Thus, the most obvious factor is the difference between the amounts of housing supply and its demand in urban areas where population grows. It should be stressed that in such metropolitan cities, restrictive land-use policies and planning and lengthy approval procedures limit the construction of additional housing stock, and thus prices grow. Moreover, scholars argue about the impact of flows of global capital and investment in real estate on transformation of housing in financial assets for investors' profits. Furthermore, such themes as growing income inequalities and transformations of labor market are also considered in the literature. Thus, despite the rapid increase in housing costs, salaries of low- and medium-income groups do not rise, and, thus, the problem of affordability increases. Moreover, it concerns mainly people with limited opportunities of becoming owners of their homes and paying for rents. Besides, housing costs are associated with certain social problems such as discrimination, poverty, and unemployment. In particular, scholars stress that in urban areas, people have to spend additional money to pay for their travel and thus to overcome geographical distance to places of employment, hospitals, educational institutions, and entertainment areas. Finally, the variety of public policy measures to mitigate the urban housing affordability issues is discussed in current literature. On the one hand, various supply measures can include the liberalization of zoning regulations and more active construction. On the other hand, demand-based measures include subsidies and various vouchers for paying for rent or housing. There are some other policies that include rent control policies, inclusionary zoning, public housing, community land trusts, etc. The problem of the inefficiency of individual policies exists. This paper reviews some current discussions in the field of urban housing affordability in terms of definitions and measurements of affordability, its causes and consequences, and possible policies.

As more people move into cities for employment, education and investment opportunities, achieving adequate housing has been an increasingly expensive challenge in metropolitan areas worldwide. Urban housing affordability – the affordability problem in cities – has been a significant theme in urban studies, policy and housing economics in recent years. A broadly held definition of affordability holds that this involves comparing the cost of housing with people’s income – often represented by the proportion of income spent on rent and housing finance. However, it is increasingly argued that affordability issues involve more than this equation and relate to issues of housing location, quality, the availability of amenities and services, tenure and social exclusion. Several structural explanations for urban housing affordability are widely recognized in the literature on the subject. First is a disconnect between housing supply and demand. In many fast-growing and in-demand cities this disconnect reflects issues such as restrictions on land use, elongated approval processes for housing, and land scarcity – which can combine to restrict new housing output and thus prices. The literature on real estate investment and global capital markets also highlights the process of commodification of housing that has occurred – in which land and housing have been reoriented from social goods to financial assets – with significant investor demand, short-term rental services, and speculator and buy-to-let activity pushing prices upwards in many global cities. The literature also focuses on income inequality and changing labour markets, where rising housing costs for most if not all households have coincided with stagnating income growth for those households with lower incomes thus creating affordability gaps that have often proved difficult to bridge. Indeed it is typically renter households and in particular young people and families who continue to face unaffordable rent levels as well as the prospect of buying a home of their own, alongside the rising costs that may follow. Some recent literature additionally notes that affordability issues are inseparable from spatial inequality, as where relatively cheaper accommodation is located often incurs costs such as increased transportation expenses, poorer service accessibility and greater distance from employment opportunities. While considerable attention has been devoted to potential solutions such as improving and fast-tracking the building of housing; better targeted housing supply (with a higher concentration of such housing); and more extensive programmes of housing subsidies; such policy responses are the focus of ongoing and serious debate with respect to overall housing affordability. Other approaches continue to explore issues such as regulating rental housing, mixed use; the inclusion of social housing in private developments; using housing trusts and public land schemes; and taxing properties or empty spaces. It is widely agreed that there is no single, or stand alone policy; measures need to take on a combined approach focusing on both supply and demand as well as the wider context of economic activity. This paper presents a concise review of existing literature concerning definitions and measurement of the problems related to urban houseability, explanations, social effects of affordability problems and policy-based interventions. The review attempts to present what is a broadly held picture of how urban housing affordability is reproduced within complex urban dynamics at macro economic, spatial and social scales and frames the question in terms of issues of production and access for a range of groups and populations that inhabit the modern cities.

The affordability of urban housing has emerged as a core issue in urban studies, urban public policy and housing economics studies in the current times. Cities as the engines of economic development and population growth have seen the success of this model also lead to steadily increasing costs to access adequate housing in many regions. Affordability typically refers to the link between housing and households' income, such as the ratio of rent or mortgages paid to income. A recent scholarship, however, asserts that affordability is not only a financial concern but is also related to location, quality of housing, access to services, tenure and social inclusion. Some of the structural forces cited in the literature that led to loss in urban housing affordability are: A large part of it is the lack of housing supply. Tight land-use laws and strict planning procedures and restricted land in high-growth cities can also hamper housebuilding, leading to higher house prices. International capital flows, that is, and real estate investment have also been underlined as an effect that changes housing from a social provision to a financial asset. In many cities the investor market, the short time rental economy and the speculative development have increased the competition for housing and added to pressures of displacement. Income inequalities and labor market change are also important topics to be discussed in the literature. There has been a strong rise in the affordability gap due to faster growth in dwelling unit costs than wage growth in the low and middle income levels. For certain groups such as tenants, young adults, immigrants and key workers rent access is progressively becoming a problem as they may not be able to own their homes and pay for living. Studies also give an indication that the affordability of housing is very much related to spatial inequality, with housing that is less affordable having less access to jobs, public transport, schools and health facilities. Thus, any cut in direct housing costs can only be achieved at the expense of increased commuting or less access to urban opportunities for households. Urban housing affordability policy has been a hot topic. Supply-side strategies focus on zoning flexibility, higher density development and expedient approvals to produce more housing. Purchasing power enhancing interventions such as housing support (vouchers, rent subsidies) can be considered as demand-side interventions, but can lead to higher price when supply is constrained. Other methods include rent controls, inclusionary zoning practices, publicly funded housing construction, community land trusts, and taxing empty or speculative land. Effective affordability strategies need to tackle both market dynamics and social equity, as indicated in the literature. This paper explores debates from the literature on the challenges of urban housing affordability on definitions and measurements, the explanations behind it, the impact it has on society, and policy action on the issue. It seeks to develop these themes through a synthesis that can shed light on the generation of affordability within overall urban economic and political processes.

Housing affordability in urban areas is a subject that has gained the attention of many urbanists, policymakers, and housing economists. As urban areas around the world experience rapid growth in employment opportunities, the cost and quality of decent and affordable housing have increased dramatically. Urban housing affordability is measured as the relationship between potential householders’ income and the costs of housing (whether rental or owned) expressed as a percentage of their gross income which can be used to pay rent and/or mortgage repayments and other service charges. The concept of affordability has recently been extended by an increasing number of studies, in addition to cost, also to include location, quality, accessibility and security of tenure and social inclusion, and how these determine the affordability of urban housing. In order to understand these changes and how affordability is produced, a number of key structural factors are identified. A primary factor contributing to the decline in affordability of housing in urban areas across a large number of countries is a supply–demand imbalance that exists in many cities. Restrictions on the use of land for housing and lengthy approval processes for new construction combined with limited availability of land for development means that many cities are failing to build sufficient housing to meet demand. The urban real estate market has in recent years become a location for the flow of global capital and as a result there are now a large number of property investors, as well as a culture of short-term rental, which is placing further pressure on affordable housing in many markets. There is a considerable body of evidence about the increase in the affordability gap between rising housing costs and stagnating wages of low- and middle-income households. Various groups of households are in greater danger of being affected by lack of affordable housing than others. Not only low-income households but also middle-income households are under pressure, often because they are tenants rather than homeowners. Affordability issues particularly affect younger people, new migrants and low-wage workers in essential services, as they have limited opportunities to access homeownership. The evidence on the relationship between spatial inequality of housing costs and lack of affordability of housing in close proximity to employment centers, public transport nodes, schools and health care services is mounting. As households save on their direct costs of housing they face increased costs of commuting and are excluded from a variety of opportunities that cities offer to their residents. A number of strategies have been discussed to deal with affordability. Supply side measures, such as zoning, density, and the approval process, are often contrasted to demand side measures, including housing vouchers or rent subsidies, and measures to regulate rent, such as rent control or inclusionary zoning. Other strategies include public housing, community land trusts, and even taxation of vacant and/or speculative housing. While many current affordability strategies are based on a single measure, a more effective way to deal with current affordability challenges in urban areas is a combination of supply side and demand side measures. Moreover, a combination of measures dealing with the production of the market and measures dealing with social equity. The rest of this paper will critically review the current literature on urban housing affordability. First, a critical assessment of the definitions and of the indicators to measure urban housing affordability will be presented. Then the main causes of the problem of urban housing affordability will be explained for. The consequences of the problem for households with different incomes as well as for other groups in society will be described as well. Finally, an assessment of the current supply- and demand-side measures as well as of combinations of measures to deal with the problem of urban housing affordability will be presented. The ways in which the problem of urban housing affordability is produced in urban economies and in their political space will be summed up.

Affordability of housing has become a key focus in contemporary research on cities, public policy, and housing economics. As cities draw in more people, jobs and investment, housing costs have risen sharply in many large areas. Generally affordability is thought of as the relationship between household income and housing costs and is measured by indicators such as share of income spent on rent or mortgage. But recent scholarship stresses that affordability is not just a financial matter but also about location, quality of housing, access to services, security of tenure and inclusion socially. Literature identifies structural drivers that contribute to declining affordability of urban housing. One major factor is mismatch between supply and demand. In high growth cities restrictive regulations on land use, lengthy approval processes and limited availability of land can limit construction of new housing and contribute to price increases. Researchers also point out that flows of global capital and investment in real estate transform housing from a social benefit into an asset that is valued financially. Competition for housing has grown stronger in many cities due to investor demand, short term rental markets and speculative development and this has also put pressure on displacement. Income inequality and changes in the labor market are also major themes in research. Housing costs have risen very quickly but wages for low and middle income households have often stagnated and this has widened the affordability gap. This problem is especially acute for renters, young people, migrants and essential workers who have limited access to homeownership and they are increasingly burdened by rent. Studies also show affordability is closely related to spatial inequality because low cost housing tends to be farther from centers of employment, public transport, schools and healthcare. As a result, households reduce direct housing costs only by accepting higher commuting costs or poorer access to opportunities in cities. Policy responses to affordability for housing in cities are widely discussed. Approaches that focus supply advocate reforms in zoning to allow for higher density development and faster approval processes to increase availability of housing. On the other hand, interventions targeting demand such as vouchers or subsidies to improve household purchasing power might contribute to rising prices if supply is limited. Other approaches include rent regulation, inclusionary zoning, investment in public housing, trusts for community land, and taxing properties that are vacant or speculative. Literature suggests that no single instrument is sufficient; rather effective strategies to improve affordability need to address dynamics in the market as well as equity socially. This review looks closely at debates in literature about affordability of housing in cities. It focuses on definitions and measurements, underlying reasons for this lack of affordability, social results of this and responses to policy. By bringing together these themes, it hopes to make clear how affordability emerges within broader processes of urban economics and politics.

Data up to October 2023 Urban housing affordability has now become a central focus of contemporary urban studies, public policy and the broader field of housing economics. Cities are the locus of past population growth, employment creation and investment; consequently it shall come as no surprise that many metropolitan areas have seen housing costs skyrocket. Housing affordability is often interpreted to be the ratio of household income and housing costs—using indicators for example, share of expenditure on rent or mortgage payments. But contemporary scholarship points to affordability not only as a financial problem, but also as one of location and housing quality; access to services; tenure security; and social inclusion. The literature is abundant when it comes to the structural drivers causing declining urban housing affordability. The first group of people use a combination of the more common slang terms the most important factor is mismatch housing supply and demand Land-use regulations, lengthy planning approval processes and a shortage of available land can handcuff new housing construction in high-growth cities, leading to higher prices. Researchers have also pointed to global capital flows and real estate investment as factors converting housing from a social good into an asset for profit. Competitive bidding for housing and displacement pressures from investment demand, short-term rentals markets (like Airbnb), or speculative development continue to shape many major cities. The literature also focuses on background issues such as income inequality and the change in labor markets. Housing costs have risen sharply while wages for low- and middle-income households typically remained flat, exacerbating the affordability gap. The problem is especially acute for renters, young adults, migrants and key workers who are likely to be further from home ownership doom facing smaller chances of increased rents. These studies also highlight the relationship between spatial inequality and housing affordability, underscoring that lower-cost homes are more often located further away from employment centres, public transport links as well schools or healthcare. This means that in order to reduce direct housing costs, households might have no choice but to forego accessibility -- accepting higher commuting costs or worse access the urban opportunities. Urban housing affordability responses are intensely debated. Supply-side approaches focus on reforms to zoning, increased density and expedited permitting. Demand-side interventions, like housing vouchers or rent subsidies that increase households purchasing power, risk increasing prices in the long run if supply remains constrained. More approaches include rent regulation, inclusionary zoning (which incorporates some affordable housing in development projects), public housing investment, community land trusts and taxation of vacant or speculative properties. Our literature review highlights that there is no silver bullet, and effective affordability strategies must incorporate both market-supply-side dynamics and socio-economic equity. The investigation reviews principal debates inside the literature on urban housing affordability taking into account conceptualizations and measurements, explanations; social implications, moreover policy responses. In synthesizing these themes, it seeks to make explicit the relations that produce affordability in urban economic and political processes.

Affordability of urban housing is a key challenge in current urban studies, public policy and housing economics. The primary metropolitan areas are attracting population growth, job opportunities and investment as cities gain in permanence over the past two decades with such rising demand translating into rising barriers to access housing. Housing affordability is traditionally interpreted as the balance between household income and housing costs, typically indexed by such indicators as the rent or mortgage repayments as a share of household incomes. Recent scholarship, however, highlights that affordability is not merely an economic issue but rather one related to location, housing quality, access to services, tenure security and social inclusion. Several key structural drivers of urban housing affordability decline have been highlights in the literature. This mismatch between the housing supply and demand is one of the main causes. In high-growth cities, restrictive land-use regulations, slow planning approval processes and little buildable land can all hold back new housing construction and help push up prices. Also, researchers have noted how global capital flows and real estate investment in the economy as a whole has turned housing from a social good to being treated as a financial asset. Mixed metro, in many cities, the demand for investors and short-term rental markets has intensified competition for housing and pushed displacement. The other key themes are income inequality and labor market change. Housing costs have risen sharply, but local blended low- and middle-income household wages have stagnated; this has opened the affordability gap even wider. This problem is a particular crisis for those unable to easily exempt themselves from the effects of rising housing costs, such as renters, young adults, migrants and keyworkers who are now faced with restricted access to home-ownership yet an increasing exposure to rent burdens. Additionally, research reveals that the proximity of lower-cost housing is also a factor of spatial inequality because poorer housing often falls outside primary employment centers, public transport, schools and healthcare access. Thus, households could only back off on directly covering housing costs by incurring higher commuting costs or sacrificing the access to urban opportunities. The policy responses for urban housing affordability are a much-argued issue. Supply-focused approaches advocate for liberalising zoning norms, expediting the development process to enable higher-density construction and getting more housing projects approved in a time-efficient manner. Demand-side interventions — housing vouchers, rent subsidies, etc., help households to buy or lease homes and increase the purchasing power of households, but if supply is not increased at least at a rate that meets demand prices tend to go higher. Other methods include rent regulation, inclusionary zoning, public housing investment and community land trusts—especially in locations where private developments cannot keep up with new demand—and tax regimes for vacant or speculative properties. No one policy instrument seems to be enough, according to the literature; real affordability strategies cut across markets and social equity. The review discussed some controversies in urban housing affordability literature, examining definitions and measurements, root causes, social impacts and policy responses. This paper attempts to clarify the conditions under which affordability is produced within larger urban economic and political processes by knitting those themes together.

In modern urban studies, public policies, and housing economics, urban housing affordability has emerged as a major issue. Cities are observed to be attracting a growing population, employment and investment, which raises the price needed for obtaining decent housing in dozens of metropolitan areas. Housing affordability, as a rule, is understood as the correlation between households’ incomes and housing prices, measured in terms of indicators like the share of income spent on rents or mortgage payments. However, recent research points to affordability being not merely a financial issue but rather a problem related to location, housing quality, access to services, security of tenure, and social inclusion. Several structural factors contributing to urban housing affordability declining have been identified in the literature. For instance, one of the reasons is that housing supply does not correspond to demand. In cities with a strong increase of population, strict land use regulations, protracted approval processes for construction projects, and limited availability of land restrict housing construction, which leads to price growth. Besides, the importance of inflow of foreign capital and investment into real estate was discussed in terms of housing turning into a financial commodity rather than a social good. In several cities, the issue of demand from investors, short-term leasing markets, and speculative development plays a significant role in creating competition for housing. The issue of income inequality and labor market transformation is of paramount importance. In the course of time, while housing costs increased, wages of low-income and middle-income households often remained unchanged, which led to the growing affordability gap. This issue can be seen as critical for the homeless, young adults, migrants, and essential workers, as they are having little influence on owning a house and are forced to pay high rents. Furthermore, studies show that housing affordability correlates with spatial inequality as cheap housing is often situated far from job places, public transport, schools, and healthcare facilities. Thus, households manage to reduce their housing costs by increasing their commuting costs. The responses of the policy-makers to the issue of urban housing affordability are commonly discussed in the literature. However, there is a lack of agreement on the measures needed to tackle the problem. Supply-side measures are focused on changes to zoning regulations, higher density of construction, and speed-up of permissions for construction. Demand-side measures are related to enhancing the purchasing power of households. Nevertheless, while such policies are aimed at improving affordability of housing, there is a risk of price increase due to instability of supply. Other responses include rent regulation, inclusionary zoning, public investment in houses, community land trusts, and taxation of vacant and speculative properties. The literature stresses the fact that no approach can effectively provide low-income families with affordable housing without taking into account many market factors and social equity issues.

Increasing access to affordable housing in cities is one of the defining issues in urban studies, public policy, and housing research today. Around the world, cities are continuing to grow, driving development and attracting investment. As a result, housing costs are increasing rapidly in many areas, pricing local residents out of market-rate homes. Affordable housing is often understood as insufficient access to housing units that are affordable relative to household incomes. While definitions of affordability may vary, they are often based on quantitative indicators like the share of income spent on housing. Scholars and practitioners are increasingly framing affordability in qualitative terms, however, including issues related to location, quality, accessibility, security of tenure, and other aspects of housing that enable people to thrive. Extant research has pointed to several underlying drivers of the lack of affordable housing in cities. Researchers note that growth in urban populations has often outpaced housing supply, placing pressure on prices. Regulatory barriers such as restrictive land use policies, burdensome planning approvals, and limited land can also depress housing development. International capital and investors have been shown to play a role in converting housing units from a domestic consumption good to an asset. Investor demand, short-term rentals, and speculative building have contributed to growing competitiveness in some cities' housing markets. Income inequality, labor market change, and stagnant wages have also come up frequently in the research. House prices have appreciated rapidly in many cities while wages have remained flat, especially for low- and middle-income households. Renters tend to be particularly vulnerable to affordability pressures. Other groups that have been noted include young adults, migrants, and people working in insecure or essential jobs. Housing affordability has been linked with spatial inequality. In many cities, less expensive housing is far-removed from centers of employment, accessible public transit, and schools and healthcare. While households may trade accessibility for cheaper housing costs, they may incur high transportation costs or worse access to jobs and services. Many different strategies have been put forth to improve affordability for urban residents. Supply-side strategies focus on building more housing, often through upzoning, higher-density development, and streamlining planning approvals. Demand-side policies can help households pay for housing but can exacerbate price increases if housing supply cannot meet demand. Solutions such as rental assistance or housing vouchers are designed to directly support low-income households. Other strategies include rent control, inclusionary zoning, increasing public and social housing, land trusts, and taxes on empty homes or foreign buyers. Taken together, while the research offers many options for addressing affordability, experts commonly suggest that no silver bullet exists. Instead, policies that address both housing supply and demand while centering issues of social equity are likely to be most effective. This article reviews the major debates around affordable housing in cities, including how it is defined and measured, what causes it, who it affects, and how it can be addressed. The debates presented here lay out the foundation for how affordability is produced by structural forces in cities.

Urban housing affordability is a major issue in today's urban studies, public policy, and housing economics. As cities draw more people, jobs, and investments, the cost of finding decent housing has surged in many metropolitan areas. Housing affordability generally refers to the link between household income and housing costs, usually measured by the percentage of income spent on rent or mortgage payments. However, recent research shows that affordability is not just a financial issue. It also involves factors like location, housing quality, access to services, security of tenure, and social inclusion. The research points out several main reasons for the decline in urban housing affordability. One key issue is the mismatch between housing supply and demand. In cities experiencing rapid growth, strict land-use rules, slow planning approval processes, and a lack of available land can limit new housing construction, driving up prices. Researchers have also noted that global capital flows and real estate investment are turning housing from a common good into a financial asset. In many cities, demand from investors, short-term rental markets, and speculative development have increased competition for housing, leading to displacement pressures. Income inequality and changes in the labor market are also important topics in the research. While housing costs have climbed quickly, wages for low- and middle-income families have often remained flat, widening the affordability gap. This situation is especially tough for renters, young adults, migrants, and essential workers. They often have limited chances for homeownership and face increasing rent burdens. Studies show that housing affordability is closely tied to spatial inequality. Lower-cost housing is often located farther from jobs, public transport, schools, and healthcare. As a result, families may only lower direct housing costs by accepting longer commutes or reduced access to urban opportunities. Policy responses to urban housing affordability spark a lot of debate. Supply-focused approaches stress the need for zoning changes, more high-density development, and quicker approval processes to boost housing availability. Demand-side strategies, like housing vouchers or rent subsidies, aim to enhance household buying power but could lead to rising prices if supply stays tight. Other strategies include rent regulation, inclusionary zoning, public housing investment, community land trusts, and taxes on vacant or speculative properties. The literature indicates that no single policy measure is enough; effective strategies for affordability must consider both market dynamics and social equality. This review looks at key debates in the literature on urban housing affordability, concentrating on definitions and measurements, root causes, social effects, and policy approaches. By bringing together these themes, it aims to clarify how affordability develops within the larger context of urban economic and political processes.

Affordability of urban housing is a topic of considerable relevance in urban studies, public policy, and housing economics. As cities become more attractive to population inflows, jobs, and investment, the cost of gaining access to adequate housing has become a significant challenge in many urban areas around the world. Affordability is typically defined in terms of the balance between housing costs and household income, and is often measured using metrics such as the proportion of income spent on rent or mortgage payments. Yet there is growing recognition in the literature that affordability is not only about money but also includes elements of location, housing quality, access to services, tenure security, and social inclusion. The literature has identified a number of factors responsible for the reduction of urban housing affordability. One major cause is the imbalance between housing supply and demand. In cities that are experiencing significant population growth, restrictive land use controls, protracted planning processes, and scarcity of available land can limit the supply of new housing units and drive up prices. Researchers have also pointed to the impact of international investment and real estate financing on the affordability crisis. In many cities, investor buying, short-term letting, and speculative development have created greater competition for housing and exacerbated displacement. Changes in the labour market and increases in income inequality are also discussed extensively in the literature. Despite rising housing prices, many low- and middle-income households have seen their earnings remain largely unchanged, further reducing the gap between income and housing expenditure. This situation is particularly pronounced among tenants, younger people, migrants, and low-wage workers, who may experience greater difficulties in entering the housing market and face escalating housing costs. Research also shows that affordability issues are often connected to spatial inequalities, with cheaper housing being located further away from workplaces, transportation networks, schools, and hospitals. As a result, lower-income households may reduce their housing expenditure only at the expense of longer commute times or less favourable access to urban amenities. Policy measures aimed at improving the affordability of urban housing are contested in the literature. Supply-side solutions involve deregulation of the market, increasing densities, and streamlining the approval process for new housing developments. On the demand side, policies such as housing allowances and rent assistance are intended to boost household purchasing power, but may result in higher rents if supply does not keep pace. There are also alternative strategies such as rent control, mandatory affordable housing provisions, public housing investment, community land ownership, and taxes on vacant properties or speculative investment. The literature suggests that no single intervention will solve the problem; rather, effective policy frameworks should balance considerations of the housing market and social justice. This paper reviews the current literature on urban housing affordability, including the conceptualization and measurement of the concept, the main causes of unaffordability, its social implications, and proposed solutions. Through this synthesis, we seek to explain how the affordability challenge relates to larger structural forces operating in urban economies and politics.