We present a selective survey of the economic theory of intellectual property rights. After a brief description of the institutional framework, we discuss policy objectives and some basic welfare tradeoffs in intellectual property design. We consider the extent to which social objectives can be...

This paper proposes a search strategy for photovoltaic patents which allows to distinguish the photovoltaic system into sub-trajectories. Identifying and analyzing sub-trajectories is of particular importance for understanding micro patterns of technological change. The proposed search strategy...