Get your salt shakers ready, because I'm no expert on economics either.
But aren't there at least three different kinds of weathy people?
1. The entrepreneurs who are engaged in production and in investing in production. These would not necessarily be the more wealthy (excluding some investors), more the up-and-coming riche.
2. The speculators who essentially make bets on how the market will go. They are not involved in production and, as we saw in the current economic problems, are not above hedging their bets nor engaging in swindles.
3. Past investers and inheritors of wealth who derive their wealth from past investments. I added this category as an after-thought.
The first type is involved in production and in trying to increase production, which involves growing companies and hence creating jobs. The 2nd and 3rd types are not involved in production and hence are not involved in creating jobs. Tax incentives to the first type could arguably have a trickle-down effect, whereas tax incentive to the other two types would have no trickle-down effect, or minimal effect at best.
And, as it seems to me, the most wealthy are of the 2nd and 3rd types, whereas the first type would include most of the less wealthy, the ones still bulding their empires, so to speak. And the first type would also include middle-class entrepreneurs whose small businesses also provide jobs.
FWIW.