This article makes no sense, the entire thing does that the phrase was used to garner support for broad reaching support and economic policy that helps a large swath of people, but then at the bottom they stick in a subdivision of trickle down which is effectively the opposite of that (helping a small subsection would magically help everyone else)
No it is not supply side economics. If everyone equally got a 10% bump in wealth that would be a rising tide and would not be trickle down.
https://www.theidioms.com/a-rising-tide-lifts-all-boats/
This article makes no sense, the entire thing does that the phrase was used to garner support for broad reaching support and economic policy that helps a large swath of people, but then at the bottom they stick in a subdivision of trickle down which is effectively the opposite of that (helping a small subsection would magically help everyone else)