What, exactly, is “profit?” Technically, it’s income minus expenses. This does not provide a complete understanding of the concept, however. If you’re one of the many people who lined up to buy a new iPhone last week, you can appreciate how the retailer made a profit – he paid a certain amount to purchase his inventory of iPhones, added in his overhead costs, and sold it to you for a few dollars more. His supplier made a profit from him in the same manner, in a chain of commerce which extends all the way back to the manufacturer.
However, it could be said that you also profited from this transaction. You acquired a device you could not possibly have built yourself, in exchange for the earnings from a few hours of your labor. You value this device more than the other things you could have bought with the money you paid for it. Your job allowed you to efficiently convert some of your time into the money you used to make the purchase. Every voluntary transaction produces a mutual increase in value – both parties benefit, or they would not perform the transaction. The dealer wanted your money, and you wanted that iPhone. [...]
Leanlo todo aunque ya lo sepan. Pasenlo, traduzcanlo, y léanselo a sus amigos de izquierda (despacio para que entiendan).