Sexual activities between consenting adults of the same sex are still criminalized in more than one third of the countries in the world despite a global wave of decriminalization in the past sixty years. This paper empirically investigates the effect of sex ratios, i.e. relative number of men to...

This paper studies the role of population sex ratio, i.e. ratio of men to women, in the global wave of sodomy law reform in the post-WWII era. Using a global survey, this paper first finds that men are more homophobic than women and such pattern has persisted across countries and time. With a...

This paper uses the natural experiment of a large imbalance between men and women of marriageable age in Taiwan in the 1960s to test the hypothesis that higher sex ratios lead to husbands (wives) having a lower (higher) share of couple's time in leisure and higher (lower) share of the couple's...

We conducted large-scale lost letter experiments in Beijing, a megacity with more than 21 million residents, to test if the observed altruistic attribute of the letter recipient would induce more passersby to return the lost letters. The treatment letters were addressed to a nationally renowned...

We estimate the effects of early childhood malaria exposure on education and health at older ages by exploiting variations in malaria exposure risk around birth that resulted from a universal malaria eradication campaign in colonial Taiwan in the early 20th century. We find that malaria exposure...

We conducted a large-scale lost letter experiment with a novel design across all seasons in Beijing to study whether ambient air pollution influences helping behavior. We assessed air pollution by PM2.5 and PM10. Our novel design allowed us to collect real-time granular data from the streets. To...

We identify the causal effect of teacher qualifications on parents' investments in their children. Exploiting a unique, high-stakes educational setting in which teachers are randomly assigned to classes, we show that parents react to more qualified teachers by increasing their financial...

Using a natural experiment in Taiwan, this paper shows that exposure to male-biased sex ratios at the marriageable ages is associated with a greater likelihood of death in later life. Half a million soldiers from Mainland China who retreated to Taiwan after a civil war in the late 1940s were...