In a much cited paper, Wolfgang Keller (Are international R&D spillovers trade-related? Analyzing spillovers among randomly matched trade partners, European Economic Review, 48, 1469-1481, 1998) claims that international R&D spillovers are global and trade-unrelated. In following works, Keller...

Following Coe and Helpman (International R&D Spillovers, EER, 39, 859-887, 1995), the literature on the trade-related channels of international knowledge flows has flourished. Departing from Coe and Helpman's tenets on the proportionality of trade and productivity spillovers and thus relaxing...

The paper analyzes the impact of localization, urbanization and competition on firm-level TFP, using a large sample of Italian firm-level data from 1999 to 2007. In particular, the paper explores the nonlinearities of such effects, accounting for the possible presence of critical masses and/or...