Ömer Özak

The Agricultural Origins of Time Preference

This research explores the origins of observed differences in time preference across countries and regions. Exploiting a natural experiment associated with the expansion of suitable crops for cultivation in the course of the Columbian Exchange, the research establishes that pre-industrial agro-climatic characteristics that were conducive to higher return to agricultural investment, triggered selection, adaptation and learning processes that generated a persistent positive effect on the prevalence of long-term orientation in the contemporary era. Furthermore, the research establishes that these agro-climatic characteristics have had a culturally embodied impact on economic behavior such as technological adoption, education, saving, and smoking.

Geographical Origins and Economic Consequences of Language Structures

This research explores the economic causes and consequences of language structures. It advances the hypothesis and establishes empirically that variations in pre-industrial geographical characteristics that were conducive to higher return to agricultural investment, larger gender gap in agricultural productivity, and more hierarchical society, are at the root of existing cross-language variations in the presence of the future tense, grammatical gender, and politeness distinctions. Moreover, the research suggests that while language structures have largely reflected the coding of past human experience and in particular the range of ancestral cultural traits in society, they independently affected human behavior and economic outcomes.

Land Productivity and Economic Development: Caloric Suitability vs. Agricultural Suitability

This paper establishes that the Caloric Suitability Index (CSI) dominates the commonly used measure of agricultural suitability in the examination of the effect of land productivity on comparative economic development. The analysis demonstrates that the agricultural suitability index does not capture the large variation in the potential caloric yield across equally suitable land, reflecting the fact that land suitable for agriculture is not necessarily suitable for the most caloric-intensive crops. Hence, in light of the instrumental role played by caloric yield in sustaining and supporting population growth, and given importance of pre-industrial population density for the subsequent course of economic development, the Caloric Suitability Index dominates the conventional measure in capturing the effect of land productivity on pre-colonial population density and the subsequent course of economic development.

The Origins and Long-Run Consequences of the Division of Labor

This research explores the deep historical roots and persistent effects of the division of labor in pre-modern societies. It advances the hypothesis, and establishes empirically that population diversity had a positive causal effect on the division of labor. Based on a novel ethnic level dataset combining geocoded ethnographic, linguistic and genetic data, this research exploits the exogenous variation in population diversity generated by historical migratory patterns to causally establish that higher levels of population diversity were conducive to economic specialization and the emergence of trade-related institutions that, in turn, translated into differences in pre-modern comparative development. Additionally, this research provides suggestive evidence that regions historically inhabited by pre-modern societies with higher levels of economic specialization have higher levels of contemporary occupational heterogeneity, economic complexity and development.

Culture, Diffusion, and Economic Development

This research explores the effects of culture on technological diffusion and economic development. It shows that cultures direct effects on development and barrier effects to technological diffusion are, in general, observationally equivalent. In particular, using a large set of cultural measures, it establishes empirically that pairwise differences in contemporary development are associated with pairwise cultural differences relative to the technological frontier, only in cases where observational equivalence holds. Additionally, it establishes that differences in cultural traits that are correlated with genetic and linguistic distances are statistically and economically significantly correlated with differences in economic development. These results highlight the difficulty of disentangling the direct and barrier effects of culture, while lending credence to the idea that common ancestry generates persistence and plays a central role in economic development.