Bill Phillips ("Phillips Curve") used flowing water to model the economy in in 1949.
> according to his friend economist Richard Lipsey, "all the staff came out to humiliate this upstart idiot." Phillips showed how water flowed from the Treasury tank to chambers representing health and education (as the government spent money) and then got pumped back to the Treasury more or less rapidly as you pulled a lever to tweak the taxation rate. "It turned out after ten minutes that he knew more than everybody there, and they shut up," says Lipsey. They offered him a job at LSE.
https://www.npr.org/sections/planet-money/2026/04/07/g-s1-116575/how-bill-phillips-used-flowing-water-to-model-the-economy
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