Inequality is often the outcome of processes regarded as fair. Yet advantages acquired fairly in one sphere—economic, educational, or political—rarely remain confined to the domain that produced them. As these advantages spill over into other areas, they reshape opportunities and outcomes over time, gradually transforming what began as tolerable disparities into broader patterns of unequal access and influence. This process is driven not only by individual choices but also by the institutions through which social life is organized. Inequality is inherently multidimensional, relational and dynamic.
Families, cities, firms, and states are among humanity’s most important cooperative institutions, and all interact with inequality. Families transmit values and knowledge across generations. Cities facilitate exchange and innovation. Firms coordinate production and create wealth. States provide the legal and political framework within which economic life unfolds. None of these institutions exists to create injustice. Yet each can unintentionally amplify existing advantages and disadvantages.
The concern is therefore not about inequality per se, but “intolerable inequalities.” Intolerable inequalities become widely regarded as socially destabilizing, politically corrosive, economically inefficient, or morally unacceptable. The central question when considering what kind of inequality can be tolerated and when is therefore not whether an inequality is initially justified, but how social institutions can transform acceptable differences into persistent and increasingly difficult-to-justify disparities.
Families’ Transmission of Advantage
Families shape life trajectories long before the individuals brought up in them exercise meaningful choice. Much of what we value about family life consists precisely in parents helping their children succeed. Yet the same mechanisms that transmit care, knowledge, and support also transmit advantages and disadvantages.
Inequality implies unequal access to resources. Families differ in their capacity to invest in their children. Wealth provides the most straightforward resource. Long before inheritances are distributed, family wealth influences access to a secure food supply, safer neighborhoods, better healthcare, higher-quality schools, and protection against economic shocks.
These advantages can accumulate over time. Research on early childhood development suggests that persistent deprivation can constrain cognitive, social, and emotional skill formation. Nobel laureate James Heckman and his collaborators have argued that high-quality early childhood interventions generate substantial long-term returns. These interventions can influence educational attainment, labor-market outcomes, and lifetime earnings.
Educational systems may also reinforce patterns of inequality. Access to elite universities depends not only on ability but also on preparation, information, social networks, and supplementary investments such as tutoring. Harvard’s Raj Chetty and his coauthors find that students from very high-income families are substantially more likely to attend elite institutions than students with similar measured academic performance from less affluent backgrounds. This suggests that factors beyond individual ability and effort influence access to opportunity.
“…differences in starting conditions can influence the probabilities people face throughout their lives, making the quest to overcome one’s circumstances more or less difficult.”
Evidence from the OECD Survey of Adult Skills similarly indicates that parental background affects economic outcomes even after controlling for educational attainment. Such findings are consistent with the view that families transmit not only formal education but also information, expectations, social capital, and non-cognitive traits valued in labor markets.
This is not to say that family background determines one’s destiny. People often overcome difficult circumstances. Nevertheless, differences in starting conditions can influence the probabilities people face throughout their lives, making the quest to overcome one’s circumstances more or less difficult.
If families are the primary mechanism through which advantages are transmitted across generations, cities are the environments in which those advantages are spatially distributed and reinforced.
Cities’ Allocation of Opportunity
Cities concentrate people, capital, and ideas. By facilitating specialization, knowledge spillovers, and exchange, they have historically been engines of innovation and prosperity. As Edward Glaeser observes, urban life often makes people richer, smarter, healthier, and more productive.
Yet the same forces that generate opportunity can also magnify disparities.
Cities concentrate economic activity, and the close physical proximity they create makes differences in income and living conditions highly visible. Yet proximity between high and low income groups can weaken support for inclusion. Repeated exposure to stark differences tends to normalize inequality, reducing its moral salience. Sharing the same space also encourages attribution effects and merit based explanations: if we live in the same city and I succeed while you don’t, the credit seems to be mine and the blame yours. Both the normalization and attribution effects make structural injustice less visible and reduce pressure for corrective policies. Urban life therefore creates a paradox: cities promote interaction and mobility while making socioeconomic divisions more visible—and, through these mechanisms, more persistent.
A longstanding question in urban economics concerns the relationship between family resources and neighborhood quality. If strong local institutions can compensate for disadvantages at home, neighborhoods may reduce inequality. Much of the evidence, however, suggests that neighborhood quality often complements family resources rather than fully offsetting disadvantages. High opportunity environments tend to exist near and generate the greatest benefits for those already equipped to take advantage of them.
Residential sorting plays an important role in this process. Households with greater resources typically gravitate toward neighborhoods offering stronger schools, lower crime rates, and better amenities. Rising property values then create barriers that make those neighborhoods increasingly difficult for lower-income families to access. Meanwhile, less affluent households are more likely to remain concentrated in areas with weaker institutions and fewer opportunities.
Importantly, these outcomes emerge from individually rational decisions. Families naturally seek the best environments they can afford. Yet the emergent result can be substantial segregation.
Thomas Schelling famously demonstrated that highly segregated residential patterns can arise even when individuals hold only mild preferences regarding their neighbors. When educational quality, public services, and employment opportunities differ across locations, such segregation can translate spatial separation into unequal life chances.
Gentrification illustrates a related dynamic. Investment in neglected neighborhoods can improve infrastructure, attract businesses, and increase local prosperity. Yet rising rents and property values may also place pressure on lower-income residents, reducing their ability to remain in the communities they helped sustain and where opportunities are starting to arise.
Through such processes, over time, neighborhoods can become self-reinforcing systems. Reputations for poor schools, frequent crime, or limited opportunity may discourage investment and reduce economic dynamism. As opportunities diminish, upward mobility becomes more difficult. Spatial inequalities can therefore persist even without deliberate exclusion.
Firms’ Distribution of Rewards
Ronald Coase argued that firms emerge because managerial coordination can often reduce the costs of relying exclusively on markets. Modern prosperity would be impossible without them. If cities shape the geography of opportunity, firms shape how rewards are distributed and how power is exercised.
They can contribute to inequality by rewarding productivity and skill unevenly, by exploiting bargaining asymmetries, and by generating or protecting rents.
Standard economic theory predicts that workers will be paid according to their marginal productivity. In practice, however, labor markets are shaped by imperfect information, institutional arrangements, and unequal bargaining positions. Compensation therefore reflects more than productivity.
One source of divergence arises when employers possess monopsony power. When there is limited competition, firms may have greater influence over wages than competitive models predict. The magnitude of these effects is debated, but growing evidence suggests that labor market concentration can affect both compensation and worker mobility.
“Unions can therefore reduce some inequalities while potentially creating or reinforcing others.”
Labor unions have traditionally acted as a counterweight to employer power. They have often compressed wage differentials and improved working conditions for their members. Yet economists have long noted potential trade-offs. Insider-outsider models, for instance, suggest that institutions designed to protect incumbent workers may make labor market entry more difficult for younger or less experienced workers. As another instance of an institution that both binds and divides, unions can therefore reduce some inequalities while potentially creating or reinforcing others.
Technological change has made the situation even more complicated. Platform-mediated work occupies an ambiguous position between employment and self-employment. While gig work can offer flexibility, it frequently shifts economic risk onto workers and often provides fewer protections than traditional employment. For many gig workers, especially those in low-skilled platform occupations, this arrangement is associated with low pay, income volatility and limited bargaining power.
At the top of the income distribution, debates often focus on executive compensation. Some economists argue that high pay reflects the substantial value talented executives create within large organizations. Others contend that a portion of executive compensation may reflect rent extraction facilitated by imperfect corporate governance.
The distinction matters because institutional advantages can allow economic rewards to become increasingly detached from productive contribution. Such decoupling transforms initially acceptable inequalities into more persistent and potentially intolerable forms.
Firms can also contribute to inequality through mechanisms beyond employment relationships. Successful companies have an incentive to influence market structure, raise barriers to entry, and otherwise affect the competitive environment itself. When markets remain open and contestable, competition tends to erode concentrated advantages. When barriers rise, temporary success can become a durable source of economic power, allowing initially justified market advantages to persist long after the conditions that produced them.
States’ Correction and Reproduction of Inequality
The state institutionalizes property rights and provides contract enforcement, public safety, and other foundations of economic activity. It also influences inequality through policies such as taxation, regulation, redistribution, and the provision of public goods.
Yet the relationship between state action and inequality is complex.
Public choice economics emphasizes that politicians, bureaucrats, and interest groups respond to incentives much as market participants do. Political outcomes cannot automatically be assumed to reflect the public interest. Concentrated interests mobilize more easily than dispersed ones, giving organized groups greater incentives and capacity to shape policy than dispersed taxpayers or consumers.
Particularly important is regulatory capture. Rules intended to protect consumers or promote competition can also raise barriers to entry and shield incumbent firms from rivals. Large organizations are often better positioned than smaller competitors to absorb compliance costs, navigate complex regulations, and influence policymaking.
Tax systems exhibit similar tensions. Wealthy individuals and multinational corporations have better access to sophisticated tax-planning strategies than ordinary taxpayers. As a result, economic resources can sometimes be converted into political and legal advantages that reinforce existing disparities.
“The broader lesson is that state institutions can both mitigate and reinforce inequality. ”
Monetary policy presents yet another set of institutional trade-offs. During crises, central banks often implement expansionary measures to stabilize employment, financial markets, and aggregate demand. Such policies may raise the value of financial and real assets, which are disproportionately held by wealthier households. At the same time, they can support employment and income among lower-income groups. The overall distributional effects are contested. This case again highlights how even well-intentioned policymaking can produce unintended side effects, allowing what start as temporary advantages to accumulate and become more persistent.
The broader lesson is that state institutions can both mitigate and reinforce inequality. The challenge for those proposing interventions is not simply to determine whether governments should intervene, but to design institutions that preserve competition, limit rent seeking, and prevent emergent economic advantages from becoming politically protected privileges. Doing so requires recognizing that even thoughtful policy interventions can generate unintended distributional consequences. The goal cannot be intervention for its own sake, but to implement institutional arrangements that limit the tendency of both market forces and public policies to generate persistent and potentially intolerable inequalities.
Conclusion
The institutions of a free society that make prosperity possible can also contribute to persistent inequality. Families transmit advantages across generations. Cities distribute opportunities unevenly across space. Firms shape the distribution of rewards and the exercise of power. States can correct disparities but may also entrench them through capture and misguided or poorly targeted policymaking.
Inequality is not merely a static distributional outcome produced by differences in income, wealth, and opportunity. It is a multidimensional, dynamic, and relational process shaped by the interaction of institutions, incentives, and human behavior. Advantages acquired in one sphere often spill over into others, and in doing so become increasingly persistent.
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Understanding how initially acceptable, emergent inequalities evolve into more durable and potentially intolerable forms cannot be ignored by advocates of free societies. This understanding is essential for both economic analysis and institutional design. The goal cannot and should not be to eliminate all inequality, but to ensure that social institutions remain engines of cooperation and opportunity rather than mechanisms through which advantages continuously reproduce themselves.
Endnotes
Further considerations on this topic can be found in Bovi, M. (2025) The Dual Challenge of Tolerable Economic Inequality, Springer.
[1] Heckman, J. J., Pinto, R., & Savelyev, P. A. (2013). Understanding the mechanisms through which an influential early childhood program boosted adult outcomes. American Economic Review, 103(6), 2052–2086.
[2] Chetty, R., Deming, D. J., & Friedman, J. N. (2026). Diversifying society’s leaders? The determinants and causal effects of admission to highly selective private colleges. Quarterly Journal of Economics, 141(1), 51–145.
[3] OECD Survey of Adult Skills
[4] Glaeser, E. (2012) The Triumph of the City. Penguin.
[5] Edmans, A., Gabaix, X., & Jenter, D. (2017). Executive compensation: A survey of theory and evidence. NBER Working Paper No. 23596.
*Maurizio Bovi is a senior scientist at the Italian National Institute of Statistics and an adjunct professor of economics at Sapienza University of Rome. He is also the author of the 2022 book, Why and How Humans Trade, Predict, Aggregate, and Innovate, published by Springer.
Read more by Maurizio Bovi.
