How do you choose a product to market? What determines what new product or invention will sell well?

Answer 1

Three Simple Words:
"Supply and Demand," determines what new products will sell and sell well, take cell phones for example when they first came out they were so huge and only the elite society owned them, but look at em now, some are the size of a pocket calculator and every year they are coming out with something new they can do, and lastly everyone owns one, right down to our children and grand parents.

Answer 2

The key thing that determines whether a product will sell is whether people want it. Find out what people want, help them get it. That's the key to success.