A long but interesting read on why “trickle-down” economics must die.
Tl;dr, money moves more in the hands of lower-income people (because they need to be constantly spending it to, yanno, live) than it does in the hands of higher-income people, who tend to hoard it (because I guess there’s only so many yachts you can buy). Moving money through the economy creates strong economies, whereas “stagnant” money creates weak economies, and income inequality–where the rich are very rich and the poor and very poor–creates stagnant money.
So, in other words, Robin Hood had the right idea on fiscal policy all along. Go figure.