Polygyny rates are higher in Western Africa than in Eastern Africa. The African slave trades explain this difference. More male slaves were exported in the trans-Atlantic slave trades from Western Africa, while more female slaves were exported in the Indian Ocean and Red Sea slave trades from Eastern Africa. The slave trades led to prolonged periods of abnormal sex ratios, which impacted the rates of polygyny across Africa. In order to assess these claims, we construct a unique ethnicity-level data set linking current rates of polygyny with historical trade flow data from the African slave trades. Our OLS estimates show a positive correlation between the trans-Atlantic slave trades and polygyny. An IV approach shows the relationship is causal and statistically significant. We also provide cross-country evidence corroborating our findings.JEL Classification: F14, J12, N17, O55
Hollywood blockbusters are usually released in the U.S. before other foreign markets. The release gaps have declined significantly over time and varied greatly across countries. While movie piracy has been suggested as an important determinant for the release gap decision of distributors, theory and evidence suggest there are other important determinants. In this paper, we use a discrete choice release gap decision game model to disentangle the impacts of the i) release gap effect, which includes factors that provide incentives for a distributor to shorten the release gap; ii) word-of-mouth effect, which provides incentives for a distributor to lengthen the release gap; and iii) strategic effect, which accounts for the incentives blockbusters have to avoid each other. We obtain box office and release gap data from the private industry source Boxofficemojo.com. Our results suggest all three factors have an economically significant impact on distributors' release gap decision.JEL Classification: F14, L82, 034
Software piracy remains rampant despite the successful measures the Hong Kong government has taken to eradicate street piracy. This is because most people prefer substituting a counterfeit copy of a software CD (street piracy) with an illegal download of the software (Internet piracy). To support this claim, I construct a unique data set from 281 college students in Hong Kong to demonstrate two things. First, I estimate a randomcoefficient discrete choice demand system for Microsoft Office from legal and different illegal sources. Estimates obtained from a Bayesian approach, with a mixture of normal priors, indicate a strong substitution pattern between street piracy and Internet piracy. Second, I conduct counterfactuals in which street piracy is absent. Results are twofold. First, most students would switch to Internet piracy. Second, the government, by assuming that each pirated copy represents a lost sale, may over-estimate the gain from eradicating piracy by up to nine times. * I am indebted to my thesis advisor, Pat Bajari, for his continuous encouragement and support. I thank Tom Holmes, Kyoo il Kim, participants of the HKUST applied micro workshop, the FESAMES
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