Empirical evidence shows that R&D productivity decreases with firm size. I provide an explanation to this fact by developing a model of science production where heterogeneous researchers are endogenously allocated to different firms. The main assumption is that firms invest in research to...

I develop a model of science production where researchers are endogenously allocated to different sectors (for profit or non profit), and to different labs. The main assumption is that firms invest in research to increase their absorptive capacity: the ability to use and understand...