

What is the total net benefit of the 2 game played?
What is the marginal benefit of the 4 game played?
What is the marginal cost of the 4th game played?
What marginal rule did you use to determine the optimal number of games to be played? (Use acronyms please.)
What is the optimal quantity of games to be played?
What is the total benefit of reading 2 books?
What is the total cost of reading 3 books?
What is the optimal number of books to be read?

Which of these would be considered a trade-off to studying for economics?
Which of these would be considered the opportunity cost to studying for economics?