The market price for wallets is $20. Your technology is such that at your most efficient production point, the average total cost of producing a wallet is $2.50. Your manager runs into your office and shouts, "Boss!!! Average costs are rising!! Average costs are rising!!" To make a profit-maximizing decision, you should:

1. immediately stop production

2. completely ignore your manager

3. ask the manager about the marginal cost

4. ask the manager about the average total cost