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Limits on Individual Choice

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  • Sheshinski, Eytan

Abstract

Individuals behave with choice probabilities defined by a multinomial logit (MNL) probability distribution over a finite number of alternatives which includes utilities as parameters. The salient feature of the model is that probabilities depend on the choice-set, or domain. Expanding the choice-set decreases the probabilities of alternatives included in the original set, providing positive probabilities to the added alternatives. The wider probability 'spread' causes some individuals to further deviate from their higher valued alternatives, while others find the added alternatives highly valuable. For a population with diverse preferences, there exists a subset of alternatives, called the optimum choice-set, which balances these considerations to maximize social welfare. The paper analyses the dependence of the optimum choice-set on a parameter which specifies the precision of individuals' choice ('degree of rationality'). It is proved that for high values of this parameter the optimum choice-set includes all alternatives, while for low values it is a singleton. Numerical examples demonstrate that for intermediate values, the size and possible nesting of the optimum choice-sets is complex. Governments have various means (defaults, tax/subsidy) to directly affect choice probabilities. This is modelled by 'probability weight' parameters. The paper analyses the structure of the optimum weights, focusing on the possible exclusion of alternatives. A binary example explores the level of 'type one' and 'type two' errors which justify the imposition of early eligibility for retirement benefits, common to social security systems. Finally, the effects of heterogeneous degrees of rationality among individuals are briefly discussed.

Suggested Citation

  • Sheshinski, Eytan, 2010. "Limits on Individual Choice," MPRA Paper 53062, University Library of Munich, Germany.
    • Handle: RePEc:pra:mprapa:53062
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    References listed on IDEAS

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    1. Johnson, Eric J & Hershey, John & Meszaros, Jacqueline & Kunreuther, Howard, 1993. "Framing, Probability Distortions, and Insurance Decisions," Journal of Risk and Uncertainty, Springer, vol. 7(1), pages 35-51, August.
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    Cited by:

    1. Mikhalishchev, Sergei, 2023. "Optimal menu when agents make mistakes," Research in Economics, Elsevier, vol. 77(1), pages 25-33.

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    More about this item

    Keywords

    Multinomial Logit; choice-set; default options; early eligibility constraint;
    All these keywords.

    JEL classification:

    • H0 - Public Economics - - General

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