Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Under certain conditions, risk-sharing and, in particular, insurance are mutually advantageous transactions. An ideal competitive market for risk-shifting is described; the payments received by individuals depend on the resolution of all the uncertainties at the time of the market, including, for example, damages to all parties, not just to the insured. In an ideal system, premiums depend only on the total damage in a given state, not on its distribution over individuals. In particular, mitigation measures are optimally induced. The differences between the ideal model of insurance and the real world are described, and some explanations offered. Copyright 1996 by Kluwer Academic Publishers