How do you explain everyone lives by selling something.?

Everyone lives by selling something because, at its core, selling is about exchanging value. Whether it's products, services, skills, or ideas, individuals constantly negotiate and trade what they have to fulfill their needs and desires. This exchange occurs not only in formal markets but also in everyday interactions, where people "sell" their expertise, time, or even their personalities to connect and collaborate with others. Ultimately, the act of selling is fundamental to human interaction and the functioning of society.