John Maynard Keynes

Economist who recurs across Kyle’s library as a touchstone for two ideas: the leisure prophecy and the primacy of ideas. In Utopia For Realists, Rutger Bregman cites Keynes’s 1930 prediction of a 15-hour workweek — a forecast that “had become a truism” by the mid-1960s — and his line that practical men are “the slaves of some defunct economist,” read by Bregman as a prompt to identify your own ideological masters. Kyle’s note on the predicted short week wonders what its believers thought about how non-workers would support themselves, threading Keynes directly into the Universal Basic Income question. The “15-hour week” reappears in Kyle’s The Hardening Of The Great Softening - Research notes alongside John Adams’s “I must study war…” line. Double Entry credits Keynes with the conceptual leap behind national accounting — recasting the whole economy as an aggregate balance of supply and demand, the move that underwrites GDP.

He is not treated uncritically. The Man From The Future surfaces Oskar Morgenstern’s brutal private verdict in the Theory of Games milieu — Keynes as “one of the biggest charlatans who has ever appeared on the economic scene… everybody is on their belly before him.” Catastrophic Care uses Keynes more sympathetically, closing with his epigraph “When the facts change, I change my mind. What do you do, sir?” to frame author David Goldhill’s evolution from conventional Democrat to market-skeptic-of-the-system. He also appears glancingly in Poor Charlie’s Almanack (a biography of Keynes among the things Charlie Munger’s father read so absorbedly) and is invoked there for the “failing conventionally vs. succeeding unconventionally” framing.

Context: John Maynard Keynes (1883–1946) was the British economist whose General Theory of Employment, Interest and Money (1936) founded modern macroeconomics and Keynesian demand-management policy; his 1930 essay “Economic Possibilities for our Grandchildren” contains the famous 15-hour-workweek prediction.

Where this appears

• Utopia For Realists — the 1930 “15-hour week” prophecy and “slaves of some defunct economist”; threaded into Universal Basic Income.
• The Man From The Future — Morgenstern’s withering dismissal of Keynes as a “charlatan.”
• Double Entry — Keynes’s reframing of the economy as aggregate supply-and-demand, the basis of national accounting / GDP.
• Catastrophic Care — the closing “When the facts change, I change my mind” epigraph framing the author’s about-face.
• Poor Charlie’s Almanack — a Keynes biography among Munger’s father’s absorbed reading; the conventional-failure framing.
• The Hardening Of The Great Softening - Research — the 15-hour-week thread in Kyle’s essay research.
• Does Anything I Write Matter Anymore? — Noah Smith opens with Keynes’s “slaves of some defunct economist” line to argue for the power of idea injection.