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MENTAL MODEL · M9835

Tobin's Q Ratio

Tobin's Q Ratio
BusinessHigh supportFinance
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Updated 2026-08-15

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INTRODUCTION

English translation pending.

CORE DEFINITION

Tobin's Q, named after the economist James Tobin, is the ratio of a company's market value to the replacement cost of its assets. When Q exceeds one, the market values the firm above what it would cost to rebuild it, so new investment and expansion are attractive. When Q falls below one, the firm can be bought for less than the cost of recreating its assets, so acquiring existing capacity beats building fresh. At Q near one the two are in equilibrium. The key qualification is that replacement cost is hardest to estimate exactly where it matters most, in firms whose value sits in intangible assets.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Anchor On Rebuild: ask what it would cost to recreate this company from nothing today. - Read The Signal: treat Q above one as a growth mandate and Q below one as a buy signal. - Compare Within Sector: judge Q against industry peers, since absolute levels are not comparable across sectors.

anchor

Anchor fast decisions

Capital flows toward returns, so when the market values a firm above its rebuild cost, entrants and incumbents are both paid to add capacity, which eventually competes the premium away. When the firm trades below rebuild cost, no rational actor builds new capacity while a cheaper equivalent can be purchased, so investment stops and consolidation begins. The ratio thus works as a valve between the market for capacity and the market for companies, and its deviations from one predict the direction of real investment.

MINIMUM ACTION

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Source support: Explicit

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