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Risk, Uncertainty, and Option Exercise

  • Jianjun Miao


    (Institute for Economic Development, Boston University)

  • Neng Wang


    (University of Rochester)

Many economic decisions can be described as an option exercise or optimal stopping problem under uncertainty. Motivated by experimental evidence such as the Ellsberg Paradox, we follow Knight (1921) and distinguish risk from uncertainty. To afford this distinction, we adopt the multiple-priors utility model. We show that the impact of ambiguity on the option exercise decision depends on the relative degrees of ambiguity about continuation payoffs and termination payoffs. Consequently, ambiguity may accelerate or delay option exercise. We apply our results to investment and exit problems, and show that the myopic NPV rule can be optimal for an agent having an extremely high degree of ambiguity aversion.

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Paper provided by Boston University - Department of Economics in its series Boston University - Department of Economics - The Institute for Economic Development Working Papers Series with number dp-136.

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Length: 30 pages
Date of creation: Jan 2004
Date of revision:
Handle: RePEc:bos:iedwpr:dp-136
Contact details of provider: Postal: 270 Bay State Road, Boston, MA 02215
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