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      <subfield code="a">Bird, Daniel</subfield>
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      <subfield code="a">Frug, Alexander</subfield>
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      <subfield code="a">A common feature of dynamic interactions is that the environment in which they occur typically changes, perhaps stochastically, over time. We consider a general uctuating contracting environment with symmetric information, and identify a systematic eect of the uctuations in the environment on optimal contracts. We develop a notion of a separable activity that corresponds to a large class of contractual components, and provide a tight condition under which these components manifest a form of seniority: any change that occurs in these components over time, under an optimal contract, favors the agent. We illustrate how our results can be applied in various economic settings.</subfield>
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      <subfield code="a">dynamic contracting</subfield>
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      <subfield code="a">stochastic opportunities.</subfield>
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      <subfield code="a">Microeconomics</subfield>
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