Religious belief linked to economic growth in 59 countries, study finds

In a recent Wall Street Journal opinion piece, Harvard economist Roland Fryer applied economic principles to religion, framing it as one of the most successful and durable enterprises in human history. The article, published on April 20, 2026, explores why religion persists and what it produces, drawing on economic theories and sociological data to explain its market dynamics.

"Religion, as I joyfully taught my second-graders in Sunday school, was about faith and community—something beyond transactions," Mr. Fryer wrote, recalling his initial skepticism towards an economic analysis of faith. "But Becker had a gift for finding the market inside any mystery."

The analysis hinges on research by economists like Laurence Iannaccone, Robert Barro, and Rachel McCleary. Their work suggests that strict religious traditions thrive by creating high-value communities, and that belief in heaven and hell is positively correlated with economic growth across nations. Conversely, church attendance alone, when separated from belief, is negatively associated with growth.

The decline in religious affiliation in the U.S., with church membership falling below 50% in 2020 from 70% for much of the 20th century, raises the question of what is filling the void. Mr. Fryer suggests political identity and online communities are stepping in, but argues they lack the high-cost, high-trust characteristics of religious groups, ultimately providing a lower quality of "mutual insurance."

The 'Club Good' Model of Religion

The core of the economic argument rests on the concept of religion as a "club good," a theory formalized by Laurence Iannaccone. Religious communities produce valuable non-material goods like solidarity, insurance, and belonging. However, for these goods to be sustained, the community must solve the "free-rider" problem, where individuals benefit without contributing.

Religion's solution is to make participation costly. These costs are not just financial, like the tithing practiced by Latter-day Saints, but also include time and behavioral constraints, such as fasting during Ramadan for Muslims or observing the Sabbath for Jews. These visible sacrifices act as a screening mechanism, filtering out the uncommitted and ensuring that members can trust one another. This observable commitment becomes the "glue that holds the community together," making the group more valuable precisely because it is hard to join.

Belief vs. Attendance: A Key Distinction

Further research examined by Mr. Fryer, from a 2003 paper by Robert Barro and Rachel McCleary covering 59 countries, introduces a critical distinction between belief and behavior. The study found a positive correlation between a nation's economic growth and the population's belief in heaven and hell. The proposed mechanism is that internalized beliefs shape individual behavior, such as work ethic and honesty, even when not being observed.

More strikingly, the same study found that once belief is accounted for, church attendance itself is negatively associated with growth. "Sitting in the pew, on its own, does nothing," Mr. Fryer explains. "What drives the effect is conviction—belief internalized deeply enough to change behavior when no one is watching." This finding challenges the simple assumption that religious participation is a monolithic driver of social or economic outcomes.

This article is for informational purposes only and does not constitute investment advice.