Econometrica: Jan 1982, Volume 50, Issue 1

Tobin's Marginal q and Average q: A Neoclassical Interpretation<213:TMQAAQ>2.0.CO;2-P
p. 213-224

Fumio Hayashi

It is increasingly recognized that Tobin's conjecture that investment is a function of marginal q is equivalent to the firm's optimal capital accumulation problem with adjustment costs. This paper formalizes this idea in a very general fashion and derives the optimal rate of investment as a function of marginal q adjusted for tax parameters. An exact relationship between marginal q and average q is also derived. Marginal q adjusted for tax parameters is then calculated from data on average q assuming the actual U.S. tax system concerning corporate tax rate and depreciation allowances.

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