Don't enter a business partnership unless you know the person well or you have had a chance to check up on him and his business.
The fellow who writes you about "easy ways to make money" will send you for a dollar a mimeographed sheet listing dozens of plans. But they may all be rackets, Shoplifting is often done without carrying the article out of the store. A woman calls a store and explains that she is coming to return an unsatisfactory article. She goes to the store, lifts the article and goes to the refund counter where she gets cash for it, You insert blank pieces of paper into a machine-like contraption, turn a handle and new dollar pills come out of it on the other end. It works every time while the "salesman" is round. After you buy the machine for plenty of money it loses the magic touch. There are no magic money making machines.
If you see two peddlers arguing about the price of a ring, don't mix in. While you are watching they'll test the ring and find it genuine gold. As they can't agree on the price, you may offer a few dollars for it and later discover that the ring is brass.
Text read from the printed page and cleaned; old type leaves the occasional error.