Licensing in a patent thicket allows firms to either avoid or resolve hold-up. Firms' R&D incentives depend on whether they license ex ante or ex post. We develop a model of a patent portfolio race, which allows for endogenous R&D efforts, to study firms' choice between ex ante and ex post...

This paper analyzes externalities of patent box regimes in Europe. Tax reductions in foreign affiliates of a firm that also provide a profit shifting opportunity reduce the user cost of capital and thereby increase domestic investment. We test this mechanism for the case of research activity. By...