Before Reagan and trickle-down economics, it was called the horse-and-sparrow theory.
A 19th-century metaphor
"If you feed a horse enough oats, some will pass through undigested in the manure for the sparrows to eat."
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Make The Tax Code Work For People And The Economy
Instead of pursuing the old trickle-down economics fallacy through breaks for the wealthiest, maybe it’s time to use the tax code to drive useful behavior.