If marginal revenue is zero then total revenue is maximized

Which of the following lowers the current price of an nonrenewable natural resource?

A) an increase in the interest rate B) a decrease in the stock of the resource C) an increase in the marginal revenue product of the resource D) an increase in the price of a substitute resource

The per se rule was applied in the Alcoa case

a. True b. False Indicate whether the statement is true or false