Among the phenomena in economics that are not yet well-understood is the fat-tailed (power-law) distribution of firm sizes in the worldś economies. Different mechanisms suggested in the literature to explain this distribution of firm sizes are discussed in the present paper. The paper uses the...

In this work we explore some basic properties of the size distributions of firms and of their growth processes both at aggregate and disaggregate levels. First, we investigate which properties of firm's size distributions and growth dynamics are robust under disaggregation. Second, at a...

How do firms of different sizes react to trade liberalization? Leading theories suggest that, amongst continuing exporters, lower trade costs should boost exports of smaller firms by the same or a greaterrate than those of larger firms. However, studying the entry into force of the ambitious...

In 2011, the EU-South Korea Free Trade Agreement (EUKFTA) entered into force. With its focus on non-tariff barriers (NTBs), it is a leading example of a deep new generation agreement. Using detailed French customs data for the period 2000 to 2016, we investigate how exporters of different size...

This paper extends the firm heterogeneity model of Melitz (2003) by introducing a new concept of endogenous investments in process R&D. The novelty is that if a firm invests more in R&D its expected innovation return hazard rate stochastically dominates the return of less R&D investments. Due to...