Abstract
The Review of Economic Studies has instituted a new series of lectures to be given annually by a “younger” British economist at the Association of University Teachers of Economics Meetings. The choice of lecturer is determined by a panel whose members are currently Professors Hahn, Mirrlees and Nobay. This paper is a revised version of the first lecture in the series. It was presented at the AUTE Meeting held at the University of Surrey in April 1982, and was refereed in the usual way.—MAK.

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