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24 March 2015 Stochastically Induced Critical Depensation and Risk of Stock Collapse
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Abstract

This article investigates the risk of stock collapse due to stochastically induced critical depensation in managed fisheries. We use a continuous-time surplus production model and an economic model with downward-sloping demand and stock-dependent costs. First, we derive an optimal exploitation policy as a feedback control rule by applying the Hamilton-Jacobi-Bellman approach and analyze the effects of stochasticity on the optimal policy. Then, we characterize the long-term sustainable optimal state and estimate the risk of stock collapse due to stochastically induced critical depensation. We find that the optimal harvest policy in the stochastic setting is conservative at low stochasticity and approaches the myopic solution at high stochasticity. The risk of stock collapse is increasing with the stochasticity and decreasing with stock sizes.

JEL Codes: C61, Q22, Q57.

© 2015 MRE Foundation, Inc. All rights reserved.
DIWAKAR POUDEL, LEIF K. SANDAL, and STURLA F. KVAMSDAL "Stochastically Induced Critical Depensation and Risk of Stock Collapse," Marine Resource Economics 30(3), 297-313, (24 March 2015). https://doi.org/10.1086/680446
Received: 14 February 2014; Accepted: 1 January 2015; Published: 24 March 2015
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