[bhupy]

“Trickle down theory” has not been “debunked” by economists because it’s not an actual economic theory. It’s a pejorative used to criticize tax cuts.

Also the fact that technological progress/experiment typically (but not always) targets the top end of the market and works its way down is not controversial.

This phenomenon is also not what most people mean by “trickle down economics” as it relates to the pejorative against tax cuts which, again, isn’t a real theory peddled by credible economists.