Economics coined the term "neoclassical synthesis" and popularized the concept,[REF] bringing a mix of neoclassical economics and Keynesian economics and helping make this the leading school in mainstream economics in the United States and globally in the second half of the 20th century.
The 1958 text introduced a "family tree of economics", which by the 20th century consisted of only two groupings, "socialism," listing Marx and Lenin, and the "neo-classical synthesis," listing Marshall and Keynes.