A growth model is developed in which finite-lived individuals invest in human capital, and investments have a positive external effect on the human capital of later cohorts. Heterogeneous labor is the only factor of production, and higher-quality labor produces higher-quality goods. Stationary...

A model is developed in which two complementary forms of investment contribute to growth--technology and skill acquisition, and growth takes two forms--TFP and variety growth. The rate of TFP growth depends more heavily on the parameters governing skill accumulation, while variety growth...

This paper develops a model of investment decisions in which uncertainty about a one-time change in tax policy induces the firm to temporarily stop investing--to adopt a wait-and-see policy. After the uncertainty is resolved, the firm exploits the tabled projects, generating a temporary...

In a calibrated version of the model, transition paths after a policy change can display rapid growth, as in modern growth 'miracles.' In these economies policies that promote technology inflows are much more effective than subsidies to human capital accumulation in accelerating growth. A policy...

In economic situations where action entails a fixed cost, inaction is the norm. Action is taken infrequently, and adjustments are large when they occur. Interest in economic models that exhibit ''lumpy'' behavior of this kind has exploded in recent years, spurred by growing evidence that it is...

Technical change, even if it is limited in scope, can have employment, output, price and wage effects that ripple through the whole economy. This paper uses a flexible and tractable framework, with heterogeneous workers and technologies, and many tasks/goods, to analyze the general equilibrium...