This paper estimates the elasticity of elephant poaching with respect to prices. To identify the supply curve, the authors observe that ivory is a storable commodity and hence subject to Hotelling's no-arbitrage condition. The price of gold, one of many commodities used as stores of value, is...

What are the costs to women of harassment on public transit? This study randomizes the price of a women-reserved "safe space" in Rio de Janeiro and crowdsource information on 22,000 rides. Women in the public space experience harassment once a week. A fifth of riders are willing to forgo 20...