framework that contains multiple innovation sizes, multi-product firms, and entry/exit. Firms invest in exploration R&D to … regularities regarding innovation and growth differences across the firm size distribution. We also incorporate patent citations …

This chapter reviews academic research on the connections between agglomeration and innovation. We first describe the … conceptual distinctions between invention and innovation. We then describe how these factors are frequently measured in the data …, industrial diversity) that theoretical and empirical work link to innovation, and we discuss factors that help sustain these …