Question

Members of elizabeth's sorority volunteer in a soup kitchen in albuquerque. she spent last saturday helping out, and felt satisfied because she was contributing to her community. was this an exchange?

Answer 1

Yes, because serving food was exchanged for something of value—a feeling of satisfaction.
An exchange would includes every actions that make all parties involved a certain form of value or desire.A feeling of satisfaction could be included as a form of emotional desire that people could achieve by doing something that benefits others.