Marginal q revisited

Per-Olof Bjuggren

Applied Economics, 2016, vol. 48, issue 1, 52-58

Abstract: Two measures of firm investment behaviour used in the empirical research are Tobin´s q (average q) and marginal q. The marginal q is a more recently introduced measure than Tobin´s q and is not as well known. This article aims to demonstrate the advantages of using marginal q as a performance measure and is a response to an earlier critical article (Berglund, 2011) claiming an elusiveness bias. The pro arguments made in response are that the claimed elusiveness is not a problem. Furthermore, many of the evaluation problems inherent in the empirical use of Tobin´s q, like estimation of replacement cost of assets, can be avoided. From a pure theoretical standpoint, it has long been recognized that marginal q is superior to an average measure of investment behaviour such as Tobin´s q.

Date: 2016
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DOI: 10.1080/00036846.2015.1073842

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