During the period of our prolonged economic boom in the post-WWII years, the highest marginal tax rate was between 70-85%. Ours was the most stable and productive economy in the history of the world back then.
How does modern-day, trickle-down Republican economic theory explain that?
Because ours was the ONLY economy in the world still functioning. Europe was a cinder, Japan was a glowing hole in the ground. China was nothing more than peasants wading around in rice paddies. Russia was crippled by by the effects of their own earlier revolution and the costs of war. Our infrastructure was untouched, our factories humming along and our agriculture necessary to feed the world.
Why can't modern day democrats realize that?
The United States was left with the entire economic pie.