Mercari allows you to sell your stuff online without any listing fees. However, you will pay a selling fee of 10% of the listing price, so be sure to price carefully. In other words, if you list something for $100 and a buyer bargains you down to $50, you’re still paying Mercari a $10 selling fee. Basically, you buy products (in bulk is best) and ship them to Amazon for them to store. When your products sell, Amazon packs them up, ships them out and sends you the money (after taking their cut). There are people making a full-time living from FBA, while others just do it for some extra money. Buying and selling foreign currency is a fraught prospect, even for expert investors. Many investors use leverage, the practice of borrowing money to help them buy more currency. For example, if you wanted to trade $10,000 of currency, you would probably borrow at a leverage rate of 200:1.