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    <title>Optimal drilling efforts and industry structure</title>
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    <keywords>nonrenewable resources, drilling, cournot nash equilibrium, differential games, oligopoly</keywords>
    <abstract>We consider a resource extraction model with the possibility of extending the resource stock by drilling efforts and an oligopolistic competition of symmetric firms. Assuming a hyperbolic market demand, we adopt the open-loop Nash equilibrium to analyze and compare the outcomes of a private vs a common resource pool. For both cases, the drilling efforts of the individual firms strongly depend on the market structure. For a low competition, the efforts increase the number of firms, and the opposite is true for a high competition. On the other hand, aggregate drilling efforts are different among the two types of pools and are opposite to Schumpeterian&apos;s hypothesis (i.e., they are either an inverted U-shaped (private pools) or strictly increasing (single pools)).</abstract>
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    <publication>AIMS Environmental Science</publication>
    <volume>11</volume>
    <number>4</number>
    <pagerange>610-627</pagerange>
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