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A Supply Approach to Valuation
A new methodology for equity valuation arises from the perspective of managers’ supply
of capital assets. Under q-theory, managers optimally adjust the supply of assets to changes
in their market value. The first-order condition of investment then provides a valuation
equation that infers asset prices from managers’ costs of supplying the assets. This equation
fits well the Tobin’s q levels across many testing assets, including portfolios formed on q.
With current investment-to-capital as the only input, the supply approach does not require
cash flow forecasts or discount rate estimates, both of which are notoriously difficult to
obtain in practice.
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