Give someone $100, $1000 or even $100,000 with these guidelines:
They can use the money in any way they want. They can either spend it or use it for making more money.
When they use it for making money, they must only use that money given to them and no other. They can start a business, put it in stocks, buy and sell stuff, invest in something, etc.
At the end of the given time period, They must give back all money they have left, up to the amount given to them in the first place. They keep any money over that amount.
