"Trickle-down" -- 30 years later there is still no basis for this cheery pablum. Mike, the first thing to understand is that "trickle-down" economics is NOT the same as free market economics.
The theory behind trickle-down is very simple, but generally misunderstood - to provide economic incentives that will ultimately lower unemployment and therefore ultimately INCREASE the amount of collected revenue. Most supply-side activists don't want to tackle the REAL issue, and that is reducing the size of govt.
As a matter of fact, when you get beyond the superficial economic views of the general media, history shows that Reagan was far more of a Keynesian than most realize.