New institutional economics

Why are some societies rich and others poor? Classical economics pointed to capital, labour and technology. New institutional economics (NIE) argues that these proximate causes depend on deeper ones: the institutions that structure incentives to invest, trade and innovate. Douglass North defined institutions as "the rules of the game in a society", the humanly devised constraints that shape human interaction, including formal rules (constitutions, laws, property rights), informal constraints (norms, conventions, codes of conduct) and their enforcement.

The approach is "new" in contrast to the older American institutionalism of Veblen and Commons, which was largely descriptive. NIE keeps the tools of neoclassical economics but adds transaction costs, imperfect information and the political origin of rules.

Transaction costs

Ronald Coase asked in "The Nature of the Firm" (1937) why firms exist if markets allocate resources efficiently. His answer was that using the market has costs: finding partners, negotiating, writing and enforcing contracts. Firms exist where hierarchy is cheaper than contracting. In "The Problem of Social Cost" (1960) he argued that, if transaction costs were zero, parties would bargain to an efficient outcome regardless of the initial assignment of rights; since they never are zero, the legal assignment of rights matters.

Governance structures

Oliver Williamson developed transaction cost economics, analysing when transactions are governed by markets, hierarchies or hybrid forms, depending on asset specificity, uncertainty and frequency. Investments specific to a relationship expose parties to hold-up, which favours integration or long-term contracts.

Institutions and history

Douglass North's Institutions, Institutional Change and Economic Performance (1990) argued that institutions reduce uncertainty, that they change incrementally, and that change is path-dependent: organisations that benefit from existing rules shape their evolution, so inefficient institutions can persist. North received the 1993 economics prize with Robert Fogel for renewing economic history through economic theory and quantitative methods.

Credible commitment

Douglass North and Barry Weingast argued that the institutions established after England's Glorious Revolution of 1688, especially parliamentary control of finance and an independent judiciary, allowed the Crown to commit credibly to respecting property rights, and that capital markets responded with cheaper public borrowing. The argument became a model of how constraints on rulers enable growth.

Institutions as fundamental cause

Daron Acemoglu, Simon Johnson and James Robinson (2001) used estimated mortality rates of early European settlers as an instrument for institutions, arguing that where Europeans could settle they built inclusive institutions, and where they could not they built extractive ones, with lasting effects on income. Acemoglu, Johnson and Robinson received the 2024 economics prize for studies of how institutions are formed and affect prosperity.

Governing the commons

Elinor Ostrom, who shared the 2009 prize with Williamson, brought institutional analysis to common-pool resources, showing that communities often craft effective rules without either privatisation or state control.

• Property titling: programmes giving formal land titles to squatters in Latin America were inspired partly by NIE, with mixed effects on investment and credit.
• Development policy: from the 1990s the World Bank and other donors emphasised governance, rule of law and anti-corruption reforms as preconditions for growth.
• Special jurisdictions: charter cities and special economic zones such as Shenzhen and Próspera are justified as ways to import better rules into a limited area.
• Corporate governance and regulation: transaction cost reasoning informs antitrust analysis of vertical integration and the design of regulatory contracts.
• Comparative history: the divergence of North and South Korea is often used as an illustration of institutions overriding geography and culture.

• Glorious Revolution revisited: Nathan Sussman and Yishay Yafeh found that British interest rates remained high and volatile for four decades after 1688 and that Britain did not borrow more cheaply than countries with weaker property protection, concluding that institutional reforms were not rewarded quickly by markets.
• Settler mortality data: David Albouy argued that many settler-mortality figures in Acemoglu, Johnson and Robinson's data were assigned from other countries or combined incomparable populations, and that the estimates are not robust when these issues are addressed.
• Human capital first: Edward Glaeser and co-authors argued that common institutional measures capture outcomes rather than constraints, and that human capital may be a more basic source of growth, with institutions improving as societies grow richer.
• Definitional breadth: if institutions include everything from constitutions to customs, the theory risks becoming unfalsifiable.
• Functionalism: early NIE tended to explain institutions by their efficiency; North himself later stressed power, ideology and the persistence of inefficient rules.
• Policy transfer: attempts to transplant formal institutions often fail when informal norms and enforcement differ.

New institutional economics transformed economics, economic history, development studies and political science. The core propositions that rules and their enforcement shape incentives, that transaction costs matter, and that institutional change is path-dependent are widely accepted. Specific causal claims, especially about the Glorious Revolution and colonial origins, remain actively debated. For institution designers, NIE suggests that credibility of commitments, low transaction costs and alignment between formal rules and informal norms matter as much as the formal content of the rules.

• Coase, "The Nature of the Firm" (1937)
• Coase, "The Problem of Social Cost" (1960)
• North and Weingast, "Constitutions and Commitment" (1989)
• Acemoglu, Johnson and Robinson, "The Colonial Origins of Comparative Development" (2001)
• Sussman and Yafeh, "Institutional Reforms, Financial Development and Sovereign Debt" (2006)
• Douglass C. North, Institutions, Institutional Change and Economic Performance (Cambridge University Press, 1990)
• Oliver E. Williamson, The Economic Institutions of Capitalism (Free Press, 1985)