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De Finetti on insuring uncertainty


  • Alberto Feduzzi


  • Jochen Runde


  • Carlo Zappia



In the insurance literature it is often argued that private markets can provide insurance against ‘risk’ but not against ‘uncertainties’ in the sense of Knight (1921) or Keynes (1921). This claim is at odds with the standard economic model of risk exchange which, in assuming that decision-makers are always guided by precise point-valued subjective probabilities, predicts that all uncertainties can, in theory, be insured. Supporters of the standard model argue that the insuring of highly idiosyncratic risks by Lloyd’s of London proves that this is so even in practice. The purpose of this paper is to show that Bruno de Finetti, widely regarded as one of the three founding fathers of the subjective approach to probability assumed by the standard model, actually made a theoretical case for uncertainty within the subjectivist approach. We draw on empirical evidence from the practice of underwriters to show how this case may help explain the reluctance of insurers to cover highly uncertain contingencies.

Suggested Citation

  • Alberto Feduzzi & Jochen Runde & Carlo Zappia, 2010. "De Finetti on insuring uncertainty," Department of Economic Policy, Finance and Development (DEPFID) University of Siena 0310, Department of Economic Policy, Finance and Development (DEPFID), University of Siena.
  • Handle: RePEc:usi:depfid:0310

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    More about this item


    uncertainty; insurance; probability; de Finetti.;

    JEL classification:

    • B23 - Schools of Economic Thought and Methodology - - History of Economic Thought since 1925 - - - Econometrics; Quantitative and Mathematical Studies
    • D80 - Microeconomics - - Information, Knowledge, and Uncertainty - - - General
    • G22 - Financial Economics - - Financial Institutions and Services - - - Insurance; Insurance Companies; Actuarial Studies

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