Neoclassical synthesis is a school of thought in economics resulting from the fusion of Keynesian and Neoclassical theories. Popular between the 1950s to the early 1970s, the school of thought uses Keynesian theories of macroeconomics (IS-LM, emphasis of demand side factors) and neoclassical microfoundations (laws of demand, theoretical equilibrium). Maybe the General Theory, is just a special case of a standard classical problem. (Snowdon 2005, p. 123) Paul Samuelson gets some credit for helping to create this approach to macro.