Here’s a story my father use to tell:
There once was a jeweler who went to visit an accountant. The accountant examined the books, bank statements and say, “You’ve done very well for your self, what’s the key to your success?”
“I only take a four percent margin on the jewelry I sell,” said the jeweler.
“Four percent? That doesn’t make sense, you couldn’t have gotten this rich on just four percent. How did you figure four percent,” replied the accountant.
“It’s easy. I buy for one dollar and sell for five dollars and am happy with my four percent.”