Leased capital and the investment-q relation

Leased capital accounts for a large fraction of U.S. public firms’ total productive physical capital. In this paper, we extend the neoclassical investment q theory with financial frictions by explicitly considering firms’ option to lease. Our model features firms’ optimal buy-versus-lease decisions with collateral constraints and monitoring costs, and gives a strong implication that measured Tobin's Q has to be adjusted by leased capital. Empirically, we use our model as guidance to construct the lease-adjusted Tobin's Q, consistent with the recent leasing accounting change (ASC 842). We show that our lease-adjusted Tobin's Q is a superior proxy for investment opportunities, especially for firms that rent more capital.