We consider the microfoundations controversy from the perspective of economic evolution. Although the analogy between biology and economics has been noted before, it has rarely focused on clarifying the micro-macro distinction in economic theory and modelling. The micro-macro debate is more...

This paper characterizes the equilibrium for a large class of search models with two-sided heterogeneity and on-the-job search. Besides the well-known congestion externalities, we show that on-the-job search in combination with monopsonistic wage setting without commitment creates a...

Labor market theories allowing for search frictions make marked predictions on the effect of the degree of frictions on wages. Often, the effect is predicted to be negative. Despite the popularity of these theories, this has never been tested. We perform tests with matched worker-firm data. The...