Agency theory: Which of these relationships are agency?

Agency is a relationship where one person is doing work so that another can receive the benefit. It's important to note that not ever relationship is an agency relationship. Can you identify the agent in each of these cases? For example, two brothers have a relationship, but it isn't one of work and benefit. Thus, there's not agency. Subscribe to this YouTube Channel for more videos on accounting and business, or find me on facebook:   / economista   twitter:   / tetracarbon