Weegy: Marginal Cost (MC): The change in total cost as the output level changes one unit.
Marginal Revenue (MR): The change in total revenue from the sale of one additional level of output. (More)

Weegy: MR = MC
A firm’s profit is defined as its total revenue minus its total cost. In symbols, p (Q) = R(Q) - C(Q). [ A firm that wishes to maximize its profits may find the corresponding output by differentiating p (Q) with respect to output and finding the output that equates the derivative to zero:
dp (Q)/dQ = dR(Q)/dQ - dC(Q)/dQ = MR - MC = 0. That is, profit maximization requires that, if the firm chooses to produce anything at all, it ... (More)

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