Investment, Capacity Utilization, and the Real Business Cycle.

This paper adopts Keynes' view that shocks to the marginal efficiency of i nvestment are important for business fluctuations, but incorporates i t in a neoclassical framework with endogenous capacity utilization. I ncreases in the efficiency of newly produced investment goods stimula te the formation of "new" capital and more intensive utilization and accelerated depreciation of "old" capital. Theoretical and quantitat ive analysis suggests that the shocks and transmission mechanism stud ied here may be important elements of business cycles. Copyright 1988 by American Economic Association.