Price Quantity Marginal Cost $12 1,000 11 2,000 10 3,000 9 4,000 8 5,000 6,000 What is the profit-maximizing output level for the monopoly firm described in the table above if the firm is earning a positive economic profit? ing O 2,000 units 3,000 units 4,000 units 5,000 units We don't have enough information to determine optimal output level