The Marginal-Cost Curve and the Firm's Supply decision Costs This section of the and firm's Mc curve is Revenue also the firm's MC supply curve. aTC AVC 0 Q1 Q2 Quantity0 Quantity Costs and Revenue MC ATC AVC Q1 P1 P2 Q2 This section of the firm’s MC curve is also the firm’s supply curve. The Marginal-Cost Curve and the Firm’s Supply Decision