Selling books on Amazon is a low-risk and low-budget investment. Books are something that never goes out of style and everybody loves to kick back with one while relaxing.
There are always many books with exciting new releases that people want to get their hands on. This means that the profit margin for selling books is remarkably high. But as a seller, you need to do a fair amount of research on what kind of books you want to sell, find one that has the highest demand, or even opt to sell used books.