What do you think banks do? What do you think the stock market is?
I think banks suck money out of the system through things like front-running the market. I think the stock market is largely a casino for the mega rich.
Yes, when a corporation makes a stock offering, they are raising money that will hopefully create jobs. Once that initial money is raised, however, the stock market's function as a job creating vehicle is greatly reduced. If a company's stock price goes up 10%, the value of their holding may be valued more, and they may be able to borrow more on margin, but this is negligible compared to the amount of money raised during an IPO. Moreover, that increase in value will ONLY create jobs through capital expenditure.
Banks also make money loaning money to businesses, who then in turn use that money in potential job creation. However, businesses only make large capital investments like this when there is unmet demand that they see can be exploited. When there is unexploited demand in the marketplace, money comes out of the woodwork to capture that market segment. I promise you there is no business in the US that is lacking for investment funds to satisfy demonstrable unmet demand.
In short, in our current economic climate, there is no unmet demand. No amount of capital investment can create demand; capital investment creates supply. This is why economists refer to your views as supply side economics, trickle down, or my preferred term, fucking voodoo. The solution to our economic woes are to increase demand. That means putting money in the hands of people who will spend it, not people who will invest it.
For further information, I suggest picking up any high school level economics book. Supply and demand should be well covered.