From: Wapshott, Nicholas, "Keynes and Hayek," Pg. 263, Norton:New York (2011).
"According to Nobel prize winning MIT Economist Robert Solow, "The boom that lasted from 1982 to 1990 was engineered by the Reagan Administration in a straightforward Keynesian way by rising spending and lowered taxes, a classic case of expansionary budget deficit."
Galbraith (The Harvard Economist) agreed. "[Reagan] came into the presidency as the country was experiencing a rather disagreeable recession and [implemented] lots of strong Keynesian policy," he said, "One of the results was an improving economy in the Eighties under Ronald Reagan. And one of the amusing facts of that was that this was done by people who didn't really understand Keynes and who were critical of him. We had involuntary anonymous Keynesianism."
...
"Galbraith humorously dismissed trickle down as the "horse and sparrow theory: If you feed the horse enough oats, some will pass through to the road for the sparrows."
"[Walter Mondale scoffed] "the idea behind Reaganomics is a rising tide lifts all yachts."
And of course Reaganomics proved to be not only Keynesian but way over the top Keynesian, far beyond anything Keynes himself would have recommended. And the result was monstrously high deficits. To make matters worse, the spending was on mainly wasting assets rather than on investment which would have paid for itself.