This paper proposes an explicit test for determining the significance and the timing of" slowdowns in economic growth during the postwar period. We examine a large sample of" countries (both industrialized and developing), and find that a majority though not all " exhibit a significant...

This paper provides evidence on the unit root hypothesis and long-term growth by allowing for two structural breaks. We reject the unit root hypothesis for three-quarters of the countries approximately 50% more rejections than in models that allow for only one break. While about half of the...

This paper presents an endogenous growth model that explains the evolution of the first and second moments of productivity growth at the aggregate and firm level during the post-war period. Growth is driven by the development of both (i) idiosyncratic R&D innovations and (ii) general innovations...