https://www.thebalance.com/trickle-down-economics-theory-effect-does-it-work-3305572
Trickle-down economics, also known as trickle-down theory or the horse and sparrow theory, is the economic proposition that taxes on businesses and the wealthy in society should be reduced as a means to stimulate business investment in the short term and benefit society at large in the long term. In recent history, the term has been used by critics of supply-side economic policies, such as "Reaganomics". Whereas general supply-side theory favors lowering taxes overall, trickle-down theory more specifically targets taxes on the upper end of the economic spectrum.[1][2] Empirical evidence shows that the proposition has never managed to achieve its stated goals.[3][4][5][6]