Larry Iannaccone on the Economics of Religion

Episode Summary

Executive Summary: Russ Roberts and Larry Iannaccone discuss the economics of religion as the study of religion’s human behavior, institutions, and incentives—not theology or money. Iannaccone argues that religious freedom and competition raise participation and vitality, while barriers to entry and state churches suppress it. He also explains sects and cults as rational responses to free-rider problems, using costly practices to build commitment and provide valuable community, support, and discipline.

Main Topics: What the economics of religion studies (Priority: 5/5): Iannaccone defines the field as analyzing how people, institutions, and incentives shape religious behavior, drawing on rational choice, markets, and equilibrium rather than theology or church finances. Religious markets and competition (Priority: 5/5): The conversation’s central claim is that religions compete like firms; greater freedom and lower barriers to entry produce more innovation, higher participation, and more vibrant religion. State churches and regulation (Priority: 5/5): Historical and cross-national evidence is used to show that monopolistic or state-supported religions tend to be less active and less believed, especially in Europe and Scandinavia. The U.S. as a natural experiment (Priority: 4/5): The First Amendment created a large-scale experiment in religious freedom, and the decline of establishment was followed by revivals and rising religiosity rather than collapse. Cults, sects, and rational commitment (Priority: 5/5): Costly visible sacrifices—dress, diet, grooming, and behavior—are framed as rational mechanisms for screening out free riders and sustaining cohesive groups. Religion, social support, and human needs (Priority: 4/5): Religious groups supply non-market goods such as care, affection, parenting norms, mutual aid, and moral discipline, especially for the young, old, and vulnerable. Religion, atheism, and group identity (Priority: 3/5): Iannaccone argues that many atheists are not representative intellectual elites, and that both secular and religious groups can function like tight-knit identity communities.

Key Arguments: Religion can be studied economically without reducing it to money or judging its truth claims; the focus is on incentives, behavior, and institutions. Religious freedom tends to increase competition, which in turn increases participation, belief, and religious vitality. State monopolies and heavy regulation create barriers to entry that weaken religious life, much like protected firms provide worse service. The U.S. religious history suggests that removing establishment did not cause secularization; instead, it enabled growth and innovation among churches. So-called cult behaviors are often rational: costly, visible commitments solve free-rider problems and strengthen group cohesion. Religious groups provide goods markets often cannot: care, trust, belonging, discipline, and help in times of need. Visible sacrifice signals loyalty and helps groups allocate scarce resources to committed members rather than opportunists. Many criticisms of religion rely on stereotypes about irrationality, but empirical studies show religious people are broadly normal, educated, and psychologically typical. Atheism, especially among intellectuals, can also function as a kind of identity group with strong in-group/out-group boundaries. The mechanisms used by religious sects are similar to those used in sports fandom, politics, and the military: shared symbols, costly rituals, and strong collective identity.

Data Points: Years of research: 25 or so years - Iannaccone says he has spent roughly 25 years studying religion and economics. Church membership in the U.S. around the Revolution: About 13% - He says roughly 13% of the population were church members around the time of the American Revolution. Church membership in the U.S. by 1850: About 30–40% - He cites rising membership about 70 years later after disestablishment and revival. Church attendance in the U.S. today: Closer to 60–70% - He states current U.S. church membership/participation is much higher than at the founding era. Weekly church attendance in Sweden: About 3% - He contrasts Sweden’s low attendance with the U.S., despite Sweden having formal church membership. Weekly church attendance in the U.S.: About 30–40% - Used as a benchmark against Scandinavian state-church systems. Cross-national relationship: Inverse relationship - He reports that more religious freedom/regulatory openness correlates with higher belief and attendance across countries. Ph.D. training: Tends to attract irreligious people - He notes religiosity tails off sharply among those with doctoral training.

Pivotal Quotes: "the economics of religion is not about anything that really interests people about religion. But what they think is interesting about religion." — Russ Roberts: Opening setup, clarifying that the field is not about theology or church finances. "We have what we call the Establishment Clause that prevents us from having a state church, state monopoly, and we have the Free Exercise Clause that guarantees that people have the right to form whatever religious associations they want." — Larry Iannaccone: Explaining why the U.S. became a natural experiment in religious competition. "The things we associate with sectarianism make it possible for those sects to produce real goods and services that the rest of us can't get." — Larry Iannaccone: Describing how costly commitments and stigma create group cohesion and valuable non-market benefits.

Implications: The episode suggests religion is shaped by incentives as much as belief: freedom and competition foster vitality, while coercion and monopoly weaken it. It also broadens the view of religion as a source of community and discipline, not just doctrine.