This paper studies the relationship between intellectual property righ
ts (IPRs) and economic growth for a cross-section of countries for the
period 1960-1990. The analysis focuses on effects of lPRs on growth u
sing a quantitative index of IPRs. The paper finds that IPRs affect ec
onomic growth indirectly by stimulating the accumulation of factor inp
uts like R&D and physical capital. The positive effects of IPRs on fac
tor accumulation, particularly of R&D capital, are present even when t
he analysis controls for a more general measure of property rights. (J
EL O34, O40).