Sir John Richard Hicks (8 April 1904 – 20 May 1989) was a British economist. He contributed to the fields of consumer demand theory in microeconomics. In 1937, he developed the IS/LM model which summarizes a Keynesian view of macroeconomics. His book "Value and Capital" (1939) significantly extended general-equilibrium and value theory. The compensated demand function is named the Hicksian demand function in memory of him.