8. Home Depot sells new and used doors to contractors who build new homes. Home Depot also sells new and used doors to homeowners. Which of the following would be counted in GDP? (A) The sale of a used door to a homeowner. (B) The sale of a new door to homeowner. (C) The sale of a used door to contractor for installation into a new home. (D) The sale of a new door to contractor for installation into a new home.

1. Figure 1 demonstrates that (A) In the short run, the monopolistic competitor produces an output \( Q_{b} \) but in the long run after it adjusts its capacity, it will produce the allocatively efficient output, \( Q_{a} \). (B) It is not possible for a monopolistic competitor to produce the productively efficient output level, \( Q_{a} \), because of product differentiation. (C) It is possible for a monopolistic competitor to produce the productively efficient output level, \( Q_{a} \), if it is willing to lower its price from \( P_{b} \) to \( P_{a} \). (D) In the long run, the monopolistic competitor produces the minimum-cost output level, \( Q_{a} \), but in the short run its output of \( Q_{b} \) is not cost minimizing. Figure 2 In 2025, New Taipei City's Franchise and Concession Review Committee granted permission to firm A to enter the market for cable TV, ending the monopolies of firms B and C. Figure 2 shows the cable television market in New Taipei City.

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