Investment, Tobin's Q, and Multiple Capital Inputs
NBER Working Paper No. 2033
Despite their solid theoretical basis, models of business investment based on Tobin's Q theory have recorded a generally disappointing empirical performance. This paper examines one possible source of misspecification. When the firm's technology is expanded to include two or more capital inputs, the investment equation following from maximizing behavior includes Q as well as a series of additional explanatory variables. The importance of these omitted variables is assessed, and the econometric evidence is mixed, as the Multi-Capital Q model clearly dominates the Conventional specification but empirical problems remain. In addition, the implications of the parameter estimates from the Conventional and Multi-Capital models for tax policy are noted.
Document Object Identifier (DOI): 10.3386/w2033
Published: Published as "Multiple Capital Inputs, Q, and Investment Spending", JEDC, Vol. 17, no. 5/6 (1993): 907-928.