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Employee Stock Options Incentive Effects: A CPT-Based Model

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  • Bahaji, Hamza
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    Abstract

    This paper examines the incentives from stock options for loss-averse employees subject to probability weighting. Employing the certainty equivalence principle, I built on insights from Cumulative Prospect Theory (CPT) to derive a continuous time model to value options from the perspective of a representative employee. Consistent with a growing body of empirical and experimental studies, the model predicts that the employee may overestimate the value of his options in-excess of their risk-neutral value. This is nevertheless in stark contrast with a common finding of standard models based on the Expected Utility Theory (EUT) framework that options value to a riskaverse undiversified employee is strictly lower than the value to risk-neutral outside investors. In particular, I proved that loss aversion and probability weighting have countervailing effects on the option subjective value. In addition, for typical setting of preferences parameters around the experimental estimates, and assuming the company is allowed to adjust existing compensation when making new stock option grants, the model predicts that incentives are maximized for strike prices set around the stock price at inception. This finding is consistent with companies’ actual compensation practices that standard EUT-based models have difficulties accommodating their existence.

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    File URL: http://basepub.dauphine.fr/xmlui/bitstream/123456789/8915/1/DOC170412.pdf
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    Bibliographic Info

    Paper provided by Paris Dauphine University in its series Economics Papers from University Paris Dauphine with number 123456789/8915.

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    Date of creation: 2011
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    Publication status: Published in Proceedings of the 8th International Conference on Applied Financial Economics - Vol A,
    Handle: RePEc:dau:papers:123456789/8915

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    Related research

    Keywords: Stock-options; Cumulative Prospect Theory; Incentives; Subjective value;

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