When you select a product, your choice should be based upon your knowledge of how and to whom you're going to sell it. You may have the greatest bargain in the world, but it will be of no value to you if you don't know who's going to buy it, or how you are going to get the word out about it. The first rule to achievement of a fortune is to produce or buy your product for pennies and sell for dollars. So after preliminary market research to determine who will buy your product, the next question.