a. The Moon is a Harsh Mistress" It stands for There Ain't No Such Thing As A Free Lunch. This phrase is a popular way to express one of the most important economic concepts there is (hint: opportunity cost). What does the phrase mean? What is an example, anecdotes, and comments being sure to focus on the opportunity cost aspects

b. What are gains from trade in a production possibility framework.

c. What is the difference between positive and normative economics?

d. What is a cost-benefit principle as it should apply to a decision that is expect to make in the future.