To have some idea of where we are going in this world, it is useful to have some sense of where we have been. It is one thing to assert that most prominent economists of the 20th century can be divided into three groups: the Generation of the Great Depression (and World War II); the Generation of the Cold War; and the Generation of Perestroika. That is certainly true, and probably useful, as far as it goes. But it doesn’t tell us much about economics
It is quite another thing to identify the discipline’s galvanizing events from the perspective of those inside the field.
Such a chronicle of internal developments is, after all, the way economists report their news to us. Until about 1960, the big news (it reached the public well after the fact) had to do with the appearance of various books: Keynes’ "The General Theory of Employment, Interest and Money" in 1936, Hicks’ "Value and Capital" in 1939, Von Neumann and Morgenstern’s "The Theory of Games and Economic Behavior" in 1944, Samuelson’s "Foundations of Economic Analysis" in 1948, Debreu’s "The Theory of Value" in 1959, Friedman and Schwartz’ "Monetary History of the United States 1867-1960" in 1963.
After that (and in many cases before), the most significant contributions to economics are short, technical papers published in journals: Ronald Coase’s "The Problem of Social Cost" in 1960; George Akerlof’s "The Market for ‘Lemons’" in 1970, Robert Lucas’ "Expectations and the Neutrality of Money" in 1972, Fisher Black and Myron Scholes and Robert Merton’s papers on options pricing in 1973 and so on. An almost-serviceable definition of a good economist is someone who reads the journals instead of the newspapers.
A proper history of 20th-century economics would interweave these narratives, internal and external, in order to produce a coherent account of how those three unmistakable generations came to coalesce, forming unities of experience and analysis both inside the discipline and in countless countries round the world.