Comparative advantage and moonlighting

We document three facts: (i) Higher educated workers are more likely to moonlight; (ii) conditional on education, with higher wages less and (iii) the prevalence of moonlighting is declining over time for all education groups. develop an equilibrium model labor market explain these patterns. A dominating income effect explains negative correlation productivity in cross section downward trend time. part-to-full pay differential skilled (a comparative advantage) positive education. provide empirical evidence advantage using CPS data. calibrate 1994 cross-sectional data assess its ability reproduce 2017 The driving forces variables proportion workers. accounts 56% workers, 67% unskilled