How should possible policy reforms and projects be assessed when prices give misleading signals? Revenues and costs at market prices then give distorted measures of social gains and losses and our appraisal should use social opportunity costs, or correctly defined, shadow prices. We show how...

The variations in reproductive outcome according to marital and social status are of major interest in many countries. It has however been suggested recently in Sweden that socio-economic characteristics do not in general have a substantial effect on reproductive performance. It is noted that...