Your analogy is so far off the mark on how wealth is created, it's laughable.
$10 billion in family wealth is almost never held in cash, it's invested in companies, land, and other ventures. Wherever an investment is made, people are put to work collecting salaries and benefits, generally speaking.
You've made a gross oversimplification, and a misleading one at that.
No, not misleading at all. I never said the $10b kid had cash. Obviously, wheat expires (cash) and would be converted into another form of wealth. In this instance, he buys combines which have to be built by someone. You might even say he's a job creator.
But.... and this is a big but.... all investments are not job creating investments. Financial services, speculative investments, automation and robotics that increase worker efficiency but reduce the number of workers. I would argue that the efficiency of $10b in capital in the hands of a single person is far, far less efficient than $10b distributed across many people who use it to consume goods directly. The control of wealth by a small group produces a system where the rules favor the wealthy minority at the expense of the less wealthy. You can only go so far before the guillotines come out and the people take matters into their own hands.