Gee, if only we had some example of this model being applied on a national level...
Wait a minute, didn't Bush jr. push through some tax cuts, which greatly benefited the wealthy, with the promise of spurring economic growth? Two recessions later (the second of which was almost as bad as the Great Depression) and you would think people would start to get a clue. Look at a historical chart of GDP growth rates. Look at the average growth rates in the 80's and 90's compared to the growth rates in the 2000's, after the Bush tax cuts. There was no noticeable positive effects from these tax cuts on our economy. The only obvious effects were to reduce revenues and balloon the deficit, which have a negative effect on the economy (and one which is still impacting us today). How many times do we need to repeat these failed experiments before people get a clue?
To understand better the myth republicans are trying to pull here, do some research into Keynes original theory. His whole point originally was that cutting taxes during a bad recession, when combined with cutting spending in an equal amount so you don't increase the deficit, would temporarily jump start the economy and pull you out of recession sooner. He never suggested it should be permanent or that it would spur growth indefinitely. But republicans have *******ized this theory and now pretend that cutting taxes and spending over the long term would magically spur outsized economic growth indefinitely. This is an economic pipe dream. And it has been proven false multiple times. The Reagan tax cuts, the Bush tax cuts, and the Brownback tax cuts in Kansas. None of them produced outsized economic growth for any period of time. And in the case of Kansas, they resulted in just the opposite. Anyone who falls for this myth at this point is just being willfully ignorant.