This chapter discusses how the argument for a right to equal pay for work of equal value started and how it developed. It starts by noting that equal pay was promised during the Great War and then discusses the promises to implement it as a right in legislation in the following years, the failures to fulfil those promises and false steps, until the right became established. It then discusses the current problems with that right. Overall it explains the refusal to make substantive comparisons between men’s and women’s work.