1. Suppose the people of Pongo love the sound and smell of burps. When a person burps, it makes this person happy and all other people around them happy. However, burping is exhausting. When you burp in Pongo, the people around you received additional happiness through your actions. This situation is an example of?
2. A friend tells you that you are generally paid for your worth to your employer.
What does he mean by this?
Which principle of economics deals with this topic?