"Trickle Down" was a pejorative term used to attack Reagan. It's actually how economics works. It's how America became the most powerful nation in the world.
Well, in it's pure sense...yes, that's how economics works. People with money have things they desire (whether it be goods or services) which create opportunities to make money for people further down the ladder.
For example...I want a pizza. However, I don't feel like making one, I want someone to make it for me, and thus, Donatos employees now have an opportunity to earn some money. On that, we agree...
However, in terms of trickle-down in regards to government intervention and policy, that is what I believe the other poster is referring to...at which point, I went on record agreeing with them.
In terms of government policy and intervention, trickle down means:
The theory that economic benefits provided to upper income level earners will help society as a whole. In theory their extra wealth will be spent into the economy, providing wealth for lower income earners and creating jobs. This wealth in turn is spent back into the economy.
In the purest sense (in a market that hasn't been tampered with), wealth does trickle down, you're correct...however, the notion that giving even more money to people who are already wealthy in hopes that even more money will trickle down is an ill thought out notion and isn't grounded in reality (and I'm saying this as a free market capitalist and a libertarian).
Providing additional benefits to the rich is just as much crony capitalism as any other form. To think that it would work, is to be naive enough to think that they will take the benefit they just received, and race out to a mall in a middle class neighborhood and spend every cent of it. (which obviously won't happen) They're going to save a sizeable portion of that (typically around 40%)...and a good chunk of it will go toward luxury items (IE: Rich people buying things off of other rich people)
The researchers calculated that when the richest 20% of society increase their income by one percentage point, the annual rate of growth shrinks by nearly 0.1% within five years. By contrast, when the middle class earners see their income grow by one percentage point, the rate of growth increases by nearly 0.4% over the same period.
A simple way to illustrate the reason why this is:
Let's say we have $100,000 up for grabs to give out as a benefit...what's a better way to ensure that every cent of that gets into the economy via commerce? Giving it to one guy who's already rich (who will likely put nearly half of that in their savings)? Or giving a $20 bill to 5,000 middle class folks? (who will likely spend that $20 within a week)
So, again, I have no problem with the natural economic concept of trickle down...as you said, that is how commerce works. However, I do oppose the idea that going out of our way to give rich people even more money will somehow help everyone else out.
To be clear, I don't want the government tampering in the market at all in that form (giving unearned money to rich or middle class), I'd prefer to see nature take its course in the market...
Or, the short version: Natural trickle down > Poor attempt at government induced trickle down.
I don't want the government interfering at all...however, if they feel that they must get involved, worldwide track records would indicate that attempting to artificially induce middle-out seems to have a higher success rate than attempting to artificially induce trickle down.