Tobin's Q Firm Value Analysis
Tobin's q is the ratio of a firm's market value to the replacement cost of its assets, and it serves in strategy and industrial organization as a forward-looking measure of value creation and economic rent. A q above one means the market values the firm at more than it would cost to rebuild its assets, signaling that the firm earns rents -- from market power, brands, technology, or hard-to-replicate capabilities -- beyond the competitive return on capital. Lindenberg and Ross's 1981 study brought q into empirical industrial organization, developing an algorithm to estimate the replacement cost of assets and showing how q relates to monopoly power and barriers to entry. Because exact replacement costs are laborious, Chung and Pruitt's 1994 paper introduced a simple approximation built entirely from standard accounting and market data that tracks the exact measure closely, making q practical for large-sample research on firm performance.
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- Lindenberg, E. B., & Ross, S. A. (1981). Tobin's q Ratio and Industrial Organization. Journal of Business, 54(1), 1-32. · DOI 10.1086/296120
- Chung, K. H., & Pruitt, S. W. (1994). A Simple Approximation of Tobin's q. Financial Management, 23(3), 70-74. · DOI 10.2307/3665623
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