"Growth of technological variety offers more scope for the division of labor. And when a division of labor requires some specific training, the technological specificity of human capital grows and, with it, probably the firm specificity of that capital. We build a simple model that captures this...

"Professional partnerships might facilitate matching between specialized professionals and heterogeneous consumers, particularly where matching across firms is limited by information, incentives or regulation. We examine the extent to which internally-differentiated medical groups promote...