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Economists have long debated whether institutions—the formal rules and informal norms that shape economic behavior—can be studied using the same tools as mainstream neoclassical economics, or whether they require a fundamentally different approach. This tension has defined the subfield of institutional economics, which has produced two major frameworks: Original Institutional Economics (OIE) and New Institutional Economics (NIE). Each arose from a different assessment of what neoclassical theory could and could not explain, and each continues to shape how economists think about the role of law, custom, organizations, and power in economic life.
Original Institutional Economics emerged in the late nineteenth and early twentieth centuries as a direct challenge to the rising neoclassical orthodoxy. Its founders—Thorstein Veblen, John R. Commons, and Wesley Clair Mitchell—rejected the neoclassical assumption of a rational, self-interested "homo economicus" whose choices could be modeled independently of historical context. Instead, they argued that economic behavior is shaped by habits, routines, and institutions that evolve over time through cumulative causation. Veblen, in particular, criticized the neoclassical view of individuals as passive calculators, emphasizing instead the role of conspicuous consumption, emulation, and institutional inertia. Commons focused on collective action and legal frameworks, developing a theory of transactions as the basic unit of economic analysis. Mitchell pioneered empirical studies of business cycles, grounding economic theory in statistical observation rather than deductive axioms.
OIE was not merely a critique; it offered a positive research program centered on evolutionary change, bounded rationality, and the path-dependent nature of economic development. Its practitioners insisted that economic analysis must be historically grounded and interdisciplinary, drawing on sociology, law, and psychology. For a time, OIE was a dominant force in American economics, particularly at institutions like the University of Wisconsin and the National Bureau of Economic Research. However, its influence waned after the 1930s. The rise of mathematical formalism in economics made OIE's qualitative, historically rich methods seem unscientific to a new generation. The Keynesian revolution also shifted attention toward macroeconomic aggregates and fiscal policy, leaving institutional questions on the sidelines. By the 1950s, OIE had been marginalized within mainstream economics, surviving only as a heterodox tradition.
New Institutional Economics began to take shape in the 1960s as a very different response to the same question that had animated OIE: how do institutions matter for economic outcomes? Rather than rejecting neoclassical tools, NIE sought to extend them. The key insight came from Ronald Coase, who argued that transaction costs—the costs of searching, bargaining, and enforcing agreements—are central to understanding why institutions exist. In his work on the firm and on social cost, Coase showed that when transaction costs are positive, the allocation of resources depends on the structure of property rights and the form of economic organization. This opened the door to analyzing institutions as efficient solutions to transaction-cost problems.
Oliver Williamson built on Coase's foundation by developing a framework for comparing governance structures—markets, hierarchies (firms), and hybrid forms—based on their ability to economize on transaction costs under conditions of bounded rationality and opportunism. Douglass North extended the approach to economic history, arguing that institutions (both formal rules and informal constraints) shape long-run economic performance by creating incentives for productive or predatory activity. Later in his career, North incorporated ideas closer to OIE, such as path dependence and the role of ideology, but his core framework remained within the neoclassical tradition of rational choice and efficiency.
NIE proved highly successful within mainstream economics. Its practitioners won Nobel Prizes (Coase, North, Williamson), and its concepts—transaction costs, property rights, credible commitments—became standard tools in fields as diverse as development economics, political economy, and organizational theory. Unlike OIE, NIE offered a deductive, model-based approach that could be integrated with neoclassical microeconomics, making it palatable to a profession increasingly committed to formal theory and econometric testing.
The relationship between OIE and NIE is not one of simple replacement. NIE revived the study of institutions after OIE's decline, but it did so by narrowing the methodological scope. OIE had treated institutions as evolving, power-laden structures that shape preferences and constrain choices in ways that cannot be reduced to efficiency. NIE, by contrast, typically treats institutions as equilibrium outcomes of rational individuals seeking to minimize transaction costs, and it tends to assume that surviving institutions are efficient. This difference leads to contrasting analyses of institutional change: OIE emphasizes historical contingency, conflict, and the role of ideas, while NIE emphasizes incremental adjustments toward more efficient arrangements.
Despite these differences, there have been points of cross-fertilization. North's later work on path dependence and ideology acknowledged the importance of historical processes that OIE had always stressed. Some scholars within the NIE tradition have adopted more evolutionary and behavioral assumptions, blurring the boundary between the two frameworks. Nevertheless, the core methodological divide remains. OIE continues as a heterodox school, often allied with other critical traditions such as Marxian and Post Keynesian economics, while NIE occupies a respected place within mainstream economics.
Today, NIE is the dominant framework within institutional economics, especially in applied fields like economic history, development, and political economy. Its strength lies in its ability to generate testable hypotheses using standard neoclassical tools, and its concepts have been widely adopted by economists who do not identify as institutionalists. OIE, meanwhile, survives primarily in heterodox economics departments and in interdisciplinary fields such as economic sociology and evolutionary economics. Its strength is its richer account of institutional change, power, and the social embeddedness of markets.
The two frameworks agree that institutions matter for economic outcomes, but they disagree sharply on how to study them. NIE assumes that individuals are rational and that institutions can be analyzed as efficient responses to transaction costs; OIE insists that rationality is bounded, preferences are endogenous, and institutions are shaped by power and historical accident. This disagreement is not likely to be resolved soon, and it reflects a deeper divide within economics about the nature of human behavior and the appropriate methods for studying social systems. For now, institutional economics remains a field of productive tension, with each framework offering valuable insights for different questions.