Center for International and Development Economics Research

This is a model of quality ladder of machines in an endogenous growth context, when some machines are scrapped while others coexist with the latest variety, with the economic life of machines endogenously determined as in old vintage-capital models. Policies that affect this economic life of machines (for example, those influencing the gross savings or investment rate, or trade policy in a two-sector open economy) will have an effect on the long-run growth rate.