Question

Members of david’s fraternity volunteer in an urban garden project in seattle. he spent last saturday helping out, and felt satisfied because he was contributing to his community. was this an exchange?

Answer 1

Yes, because gardening was exchanged for something of value—a feeling of satisfaction

Exchange is the trade of things of value between buyer and seller so that each benefits from the exchange. An exchange did occur: David exchanges his gardening for a feeling of satisfaction; the community benefits.