I met an old friend from high school the other day, and I couldn't believe how wealthy he had become. He ran a massively successful business, but could barely get a passing grade in math class when I knew him.
I asked him how he did it.
He said it was easy.
"All I did was find a product I could make for $2 and sell for $4. You'd be surprised just how much 2% adds up over the years!"