The idea that giving tax cuts to the rich will help the poor- that helping the economy by giving money to those who invest the most will improve the economy in general. This doesn't really work- money has gravity. Money always attracts more money (see: compound interest). That's what the rich get richer, and the poor get poorer.

A tenet of supply-side economics. Predicated on the theory that a rising tide lifts all boats. Flawed in that some boats still have holes in them.

The problem with that is that America runs on a demand-side economy.

See also: Reaganomics, Voodoo economics.