Ever since Marshall (1890) agglomeration externalities have been viewed as the key factor explaining the existence of cities and their size. However, while the various micro foundations of agglomeration externalities stress the importance of Total Factor Productivity (TFP), the empirical...

Empirical research on agglomeration and regional economic growth puts high emphasis on the impact of specialization, diversity, and competition on regional employment dynamics (Glaeser et al. 1992, Henderson et al. 1995, Blien et al. 2006, Fuchs 2009). However, Beugelsdijk (2006) and Raspe/van...