Soil Heterogeneity, Social Learning, and the Formation of Close-Knit Communities

• 成果类型: Article; Early Access
• 署名作者: Raz, Itzchak Tzachi
• 署名单位: Hebrew University of Jerusalem
• 刊物名称: JOURNAL OF POLITICAL ECONOMY
• ISSN/ISSBN: 0022-3808
• DOI: 10.1086/735506
• 发表日期: 2025
• 关键词: AMERICAN WHEAT; UNITED-STATES; culture; origins; individualism; COOPERATION; EVOLUTION; mobility; self

摘要

This paper examines how environmental heterogeneity influences the formation of close-knit communities. I provide support for the social learning hypothesis, which posits that diverse environmental conditions limited American farmers' ability to learn from neighbors, weakening communal ties. I document a negative county-level association between soil heterogeneity and close-knit communities. Using individual-level data on nineteenth-century domestic migrants, I show that this association is not driven by selective in-migration and document farmers' cultural adaptation using a difference-in-differences framework. Focusing on mechanisms, I show that soil heterogeneity slowed farmers' agricultural learning and prompted those who depended on social networks to migrate elsewhere.