We simultaneously assess the contributions to productivity of three sources of research and development spillovers: geographic, technology and product-market proximity. To do this, we construct a new measure of geographic proximity that is based on the distribution of a firm's inventor locations...

We examine theoretical predictions and econometric evidence concerning franchise contracting and sales-force compensation and suggest a number of factors that ought to influence the contracts that are written between principles and agents. For each factor, we construct the simplest theoretical...