European Journal of Economics and Economic Policies: Intervention

On the long-run equilibrium value of Tobin's average Q

Reiner Franke * * and Boyan Yanovski *

Keywords: Tobin's average Q , debt and equity financing, no-arbitrage condition, fundamentalist traders


This note considers Tobin's average Q in a framework where firms finance investment by equities and debt. The determination of its long-run equilibrium value is based on positing equality of the loan rate and, adjusted for a risk premium, the return on equities. can thus be characterized as a ratio of two rates representing the somewhat modified interest costs and profits of the firms. The familiar benchmark value = 1 obtains if another condition on the risk premium holds true, which may or may not be the case. An elementary numerical check demonstrates that possible deviations of from unity are not overly dramatic.

Author Notes

Corresponding author, email: We wish to thank two anonymous referees for their comments that helped us to sharpen our arguments.

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