how does taking the pie away make it grow?....
That's not what I said. I said that concentrating the wealth - giving the wealthiest a huge share of the pie - makes it not grow. It reduces opportunity, competition, and much more that helps the pie grow, to create more stagnant fortunes.
Look, let's make this simple and look at a picture.
In the chart below, see the period from the late 40's to 1964, when the top marginal rate was 90% (the period in the 50's, Republicans were in charge, though it's still higher than later; the peak growth was in the 60's under JFK and LBJ, including when the top marginal rate was lowered to 72%. Then we got Nixon/Carter, and the oil embargo, and the beginning of inflation, and growth of the 'ok' 3-3.5% rate. Then Reagan, the excessive tax cut and a big recession, then half the cuts reversed.
Then the economy stabilized at that 3.0-3.5% rate for a while - LOWER than most of the period from WWII to Reagan. Because we were past where cuts helped growth, to where cuts were simply making the rich richer (see chart 2).
Then see the biggest growth increase in the 35 years since Reagan - it begins and ends under Clinton, when he raised taxes on the rich. Then comes the Great Recession in 2008. Get it?
http://ablog.typepad.com/.a/6a00e554717cc988330148c793e514970c-pi
http://assets.motherjones.com/politics/2011/inequality-p25_averagehouseholdincom.png