Helpman and Krugman (Market structure and foreign trade. Increasing returns, imperfect competition, and the international economy. MIT Press, Cambridge, <CitationRef CitationID="CR27">1985</CitationRef>) provide a synthesis of the traditional factor proportions theory of international trade and the theory of international trade due to the...</citationref>

This paper demonstrates that the steady-state solution of the optimal-growth problem in Romer's (1990) model of endogenous technological change is globally saddle-point stable. Surprisingly, the proof of this result is trivial. Interest in the optimal growth path is justified by the fact that...