Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
In this article, we generalize the Hoy and Robson (1981) analysis and provide a necessary and sufficient condition for insurance not to be a Giffen good. The condition gives a bound for the variation of absolute risk aversion that permits the wealth effect to be always dominated by the substitution effect. Copyright 1989 by Kluwer Academic Publishers