Briefly describe the following (in words). Do not describe them in terms of math. Give an intuitive description as if you were describing them to someone without experience in economics or mathematics. Be as brief as possible!

A) What does it mean for a consumer's preferences to be monotonic. B) What does it mean for a consumer's preferences to be transitive. C) What does it mean for a consumer's preferences to be convex. D) What is the marginal rate of substitution?

E) Why does finding where marginal cost equals marginal revenue tell us where a firm maximizes it's profit?