(Figure: Profit Maximization for a Firm in Monopolistic Competition) Look at the figure Profit Maximization for a Firm in Monopolistic Competition. Suppose that an innovation reduces a firm's fixed costs and reduces cost from ATC to ATC′. After the innovation reduced the cost, the firm's maximum economic profit is:
$0.
$30.
$1,500.
$3,000.
$1,500.