There are currently trillions of dollars worth of profits sitting in offshore accounts which don't create any jobs sitting there.

There are huge corporate stock buy-backs going on instead of R&D and community reinvestment.

Supply side economics (or the 'trickle-down' theory) has been proven a failure beyond any shadow of a doubt time and time again.

Wealthy people 'might' reinvest in the community but there's no law says they have to.  And they often don't.  Poor people don't have much choice but to spend money, moving their local economies.

Demand side economics keeps the economy moving.  Supply side just ends up with hoarders gumming up the works.