The price where quantity demanded is equal to quantity supplied is known as

An externality is the

A. secondary effect on an action B. unintended consequence of an action C. effect of an action on people or things that were not involved in the action D. unknown consequence of an action on people or things who were primary parties in the action

We want money mostly because

A) it makes us happy. B) we can buy goods with it. C) we lengthen the life of our mattress. D) we trust it.