This paper surveys the development of the theory of endogenous growth, with special emphasis on models that deal with the interactions between trade and growth. A unified framework is presented and is shown to contain many models as special cases. International factor mobility is also dealt with...

The paper discusses the role of restraints in the economic System. The constraints may relate to different agents of the economic-system so that one may envision the economic system as a Set of hierarchical constraints with each layer.of constraints applying to a more disaggregated level of...