Research on the elasticity of substitution between capital and labor - ó - has been proceeding for 75 years. While there is clearly a strong case for the importance of ó in the analysis of growth and other economic issues, much less agreement exists on the value of ó. This paper offers some...

When investment is irreversible, theory suggests that firms will be "reluctant to invest." This reluctance creates a wedge between the discount rate guiding investment decisions and the standard Jorgensonian user cost (adjusted for risk). We use the intertemporal tradeoff between the benefits...

Large and sustained differences in marginal products of capital (MPKs) across countries are sharply at odds with the core implications of the neoclassical framework. Lucas (1990) and many subsequent studies have examined reasons for this MPK differential. In a recent contribution, Caselli and...

The interpretation of the significant relation between business investment spending and cash flow has been controversial. A large body of research has found that investment/cash flow sensitivities are higher for financially constrained firms. This fundamental result underlying the finance...