You lend a friend $10,000 for a year. At the end of the year your friend agrees to pay you $10,700. The interest rate on this loan is

A one-day ticket to Sea World costs $37, but a two-day pass costs $42 . What is the average cost per day for a one-day pass? For a two-day pass? What is the marginal cost of a second day at Sea World? Why might Sea World charge such a price for a second day's entrance to the park?

All externalities are detrimental.

Answer the following statement true (T) or false (F)