Edgeworth, Francis Ysidro (əsēˈdrōˌ) [key], 1845–1926, British economist, grad. Trinity College, Dublin. He was professor of political economy at Oxford and first editor (1891–1926) of the Economist. His special contribution to economics was the application of mathematical measurements, as described in Mathematical Psychics (1881). He developed the indifference and contract curves, which are part of statistical method. Much of his writing was collected in Papers Relating to Political Economy (3 vol., 1925).