Amazon Private Labels is about finding a product on Amazon that has high sales, but maybe a low number of reviews; getting that product, and labeling it as if it were yours. Basically, what you will try to do is to upgrade the presentation of that original existing product by creating your own brand. With retail arbitrage, you go to retail stores to find products on a deep discount; you buy that product; look for its original price, and sell it on Amazon to make a profit. In the long run, this practice can turn into a real hassle since you have to be constantly going out to hunt those bargains.