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Close-kin marriage, by sustaining tightly knit family structures, may impede development. We find support for this hypothesis using U.S. state bans on cousin marriage. Our measure of cousin marriage comes from the excess frequency of same-surname marriages, a method borrowed from population genetics that we apply to millions of marriage records from the eighteenth to the twentieth century. Using census data, we first show that married cousins are more rural and have lower-paying occupations. We then turn to an event study analysis to understand how cousin marriage bans affected outcomes for treated birth cohorts. We find that these bans led individuals from families with high rates of cousin marriage to migrate off farms and into urban areas. They also gradually shift to higher-paying occupations. We also observe increased dispersion, with individuals from these families living in a wider range of locations and adopting more diverse occupations. Our findings suggest that these changes were driven by the social and cultural effects of dispersed family ties rather than genetics. Notably, the bans also caused more people to live in institutional settings for the elderly, infirm, or destitute, suggesting weaker support from kin.

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This study assesses the phenomenon of resale price discounts for top-floor units of residential buildings, or "top-floor discounts." Using 1.9 million resale transactions of apartment units from South Korea, we find that top-floor discounts range from 1.3% to 8.3% of resale prices. We hypothesize that top-floor discounts exist because of larger heating/cooling costs for these units relative to those on lower levels, resulting from relatively more extreme variation in indoor temperatures unique to top-floor apartment units. Using a household-level survey data on energy consumption and exploiting variations in weather conditions and roof material across time and regions throughout South Korea, we provide evidence in support of our hypothesis. K E Y W O R D Samenities, temperature, top-floor discounts, vertical rent gradient 1 1 For more recent studies in which models with vertical dimension are analyzed, see Liu et al. (2018) and Ahlfeldt and McMillen (2018).