Heterogeneous firms are at the heart of both the New New International Trade Theory and the Micro-econometrics of International Firm Activities. One important aim of microeconometric studies is to uncover stylized facts that hold over space and time, and that can both inspire theoretical models...

This paper is a non-technical introduction to the use of three micro-econometric tools that have only recently been applied in empirical investigations of the links between international firm activities and firm performance. It shows why it is important to use these methods, how to use them in...