… is from pages 228-229 of the 1975 collection of some of Harry Johnson‘s essays, On Economics and Society; specifically, it’s from Johnson’s 1973 contribution “Inequality of Income Distribution and the Poverty Problem”:
Apart from these forms of social discrimination, contemporary society contains important forms of discrimination on other grounds, nominally economic, which help to create a poverty problem. One such is trade unionism, which by establishing a different wage for union members over nonunion members helps to keep the nonunion members poor. Another is minimum wage laws, which benefit those fortunate enough to obtain employment in minimum-wage-law industries at the expense of those not so fortunate.
