We empirically show that the short-run elasticity of substitution between capital and labor ($\sigma_t$) is countercyclical. In recessions, capital and labor are more substitutable than in expansions. We explore the effects of the countercyclicality of $\sigma_t$ on aggregate fluctuations in the...

Are human and physical capital stocks allocated efficiently across countries? To answer this question, we need to differentiate misallocation from factor intensity differences. We use newly available estimates on factor shares from Monge-Naranjo, Santaeulà lia-Llopis, and Sánchez (2019) to...

We explore learning about HIV infection odds from risky sex as a new mechanism explaining the Sub-Saharan Africa HIV epidemic. Our novel empirical evidence reveals a U-shaped relationship between education and being HIV positive across epidemic stages, which prompts the idea of asymmetric...

Using Danish administrative data, we show that IVF success is associated with maternal education: College-educated women have a 9% higher live birth chance than high school-educated women and 25% higher than dropouts. We exclude infertility causes, health, clinics, finances, and partner...