題組內容
7. At a variable cost of $32 per ounce, 10,000 ounces of silver may be extracted from a silver mine. Regardless of whether the mine is open or closed, the annual fixed expenses of ownership are $40,000. Silver may sell for $48 an ounce in half of the years, while it can only sell for $24 in the other years. Ignore taxes.
(b) \( (10\%) \) Now suppose you can costlessly shut down the mine in years of low silver prices. What happens to the average cash flow from the mine?