In Figure 8.2, at 300 units of output: Figure 8.2 Two graphs stacked vertically-TC and TR are in the upper graph; at quantity 300, TR is 200 and TC is 180; a hill shaped total profit curve is in the lower graph; * is at the top of the hill at quantity 300 In Figure 8.2, at 300 units of output: profit could be increased by producing an additional unit of output. the last unit of output does not add anything to total profit. the firm would have been better off by not producing the last unit of output. the firm should cut back output to increase profit