Who was closer to the source of business cycle fluctuations--Keynes or Prescott and Solow? Two types of business-cycle impulses which have been associated with their names -- marginal efficiency of investment shocks (Keynes) and technology shocks (Prescott and Solow) -- are studied here in a...

We develop a business cycle model in which consumption goods, physical capital, and human capital are produced in separate sectors. An important feature of the model is that human and machine inputs in the production process are treated symmetrically: each has both a stock and flow component....