Is that not the implicit agreement of capitalism? If I trade X dollars for a thing, I got something I value for it. Joy, revenge, boredom, or just a lighter loa

Is that not the implicit agreement of capitalism? If I trade X dollars for a thing, I got something I value for it. Joy, revenge, boredom, or just a lighter load in the wallet. Something must have been gained. By definition, it seems that both economists gained the experience they wanted of watching the other debase themselves.