Exhibit 21-1 Units of Total Utility of Plums Plums Refer to Exhibit 211. In this example, marginal utility Q constantly increases. 0 constantly diminishes. 0 increases then diminishes. Q diminishes then increases. The following graph shows the marginal revenue (MR) and marginal cost (MC) curves of an imperfectly competitive rm. Figure 9.2 150 Q 110 Price (dollars) im_age_. Thank yo_u.) i, According to Figure 9.2, the rm is maximizing prot at a quantity of units