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A Markup Interpretation of Optimal Investment Rules

Avinash Dixit, Robert S. Pindyck, and Sigb??rn S??dal

The Economic Journal, Vol. 109, No. 455, pp. 179-89 (April 1999)

Avinash Dixit, Robert S. Pindyck, and Sigbørn Sødal, The Economic Journal, Vol. 109, No. 455, pp. 179-89 (April 1999)

We re-examine the basic investment problem of deciding when to incur a sunk cost to obtain a stochastically fluctuating benefit. The optimal investment rule satisfies a trade-off between a larger versus a later net benefit; we show that this trade-off is closely analogous to the standard trade-off for the pricing decision of a firm that faces a downward sloping demand curve. We reinterpret the optimal investment rule as a markup formula involving an elasticity that has exactly the same form as the formula for a firm\'s optimal markup of price over marginal cost. This is illustrated with several examples.

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