As we analyze exit and entry,
p90x cheap price, it is useful to be able to analyze the firm's profit in
more detail. Recall that profit equals total revenue (TR) minus total cost (TC):
                                  Profit    TR        TC.
                                                                                                     Figure 14-4
                                                                                            THE COMPETITIVE FIRM'S LONG-
              Costs
                                                                                            RUN SUPPLY CURVE. In the long
                                                                                            run,
chd flat iron on sale, the competitive firm's
                                                                        MC
                                                                                            supply curve is its marginal-cost
                                               Firm's long-run