Invest or exit? Optimal decisions in the face of a declining profit stream

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Even in the face of deteriorating and highly volatile demand, firms often invest in, rather than discard, aging technologies. To study this phenomenon, we model the firm's profit stream as a Brownian motion with negative drift. At each point in time, the firm can continue operations, or it can stop and exit the project. In addition, there is a one-time option to makean investment that boosts the project's profit rate. Using stochastic analysis, we show that the optimal policy always exists and that it is characterized by three thresholds. There are investment and exit thresholds before investment, and there is a threshold for exit after investment. We also effect a comparative statics analysis of the thresholds with respect to the drift and the volatility of the Brownian motion. When the profit boost upon investment is sufficiently large, we find a novel result: the investment threshold decreases in volatility.

Original languageEnglish (US)
Pages (from-to)638-649
Number of pages12
JournalOperations Research
Issue number3
StatePublished - May 2010

ASJC Scopus subject areas

  • Computer Science Applications
  • Management Science and Operations Research


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