knowledge requirements tend to coagglomerate and that the importance of this shared knowledge is larger in metropolitan areas … characterizing the means by which people typically acquire knowledge. An extension to the main analysis finds that, when we focus on … metropolitan areas, the largest effects on coagglomeration are due to shared knowledge about the subjects of engineering and …

agglomeration increases the negative impact of knowledge spillover on firms' R&D efforts. We then use high-tech, firm-level data …&D investment more in denser locations than in lesser ones with the presence of knowledge spillover. This implies that local … from China to test our theoretical predictions. We develop a technological similarity index as a proxy for knowledge …