This paper analyses the stability properties of the Grossman-Helpman [Grossman, G. Helpman, E., 1991b. Endogenous product cycles. The Economic Journal 101, 1229-1241] product-variety model of endogenous product cycles. It has been shown that there exists a unique saddle path converging to the...

This paper presents a modified version of the North-South endogenous imitation model of Grossman and Helpman [Grossman, G., Helpman, E., 1991b. Endogenous product cycles. The Economic Journal 101, 1241-1229] based on the product variety framework. We show that a tighter Intellectual Property...