Supply-side theory has never worked--ever.
Every recession in history, save for Carter's brief term, has come under a Republican president implementing supply-side economic theory.
Putting money into the pockets of people who are already wealthy
does not stimulate the economy. This should be history and not economics by now.

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"Out beyond ideas of wrongdoing and rightdoing, there is a field. I will meet you there."
~ Jelaluddin Rumi, 1207-1273