Richard Ferdinand Kahn, Baron Kahn, CBE, FBA (10 August 1905 – 6 June 1989) was a British economist.
Kahn was born in Hampstead into the orthodox Jewish family of Augustus Kahn, inspector of schools and former German schoolmaster, and Regina Schoyer. He was brought up in England and educated at St Paul's School, London, and King's College, Cambridge. Kahn took a 1st in Mathematics, Part I, at Cambridge, followed in 1927 by a 2nd in Physics in the Natural Sciences tripos. Taught economics by Gerald Shove and John Maynard Keynes in 1927-28, he gained a 1st in Economics, Part II, in 1928. In 1930, he was elected a Fellow of King's College.
He worked in the Faculty of Economics and Politics from 1933. He became Director of Studies for economics students at King's in 1947, a post he held for four years. Kahn was appointed Professor of Economics in 1951, retiring in 1972.
Arguably, Kahn's most notable contribution to economics was his principle of the multiplier. The multiplier is the relation between the increase in aggregate expenditure and the increase in net national product (output). It is the increase in aggregate expenditure (for example government spending) that causes the increase in output (or income).
Kahn was made a Commander of the Order of the British Empire in 1946 and became a Fellow of the British Academy in 1960, and was created a life peer with the title Baron Kahn, of Hampstead in the London Borough of Camden on 6 July 1965.
de:Richard Kahn es:Richard Kahn fr:Richard Kahn it:Richard Kahn ja: nl:Richard Kahn ru: , zh: