1. Why does a monopolistically competitive firm produce where P > MC, unlike a perfectly competitive firm? (为什么垄断竞争企业的生产点是价格大于边际成本，而完全竞争企业是价格等于边际成本？)
📖 点击查看答案Because the monopolistically competitive firm faces a downward-sloping demand curve, its marginal revenue is less than the price, so it maximizes profit where P > MC. In perfect competition, firms are price takers with P = MR = MC.
因为垄断竞争企业面临向下倾斜的需求曲线，边际收益低于价格，因此其利润最大化点满足 P > MC。而完全竞争企业是价格接受者，满足 P = MR = MC。
2. How does the entry of new firms affect the demand curve faced by an existing monopolistically competitive firm in the long run? (新企业进入如何影响长期内垄断竞争企业的需求曲线？)
📖 点击查看答案New firms entering the market increase competition, reducing the demand for the existing firm’s product, shifting its demand curve leftward until economic profit is zero.
新企业进入市场增加竞争，导致现有企业的需求减少，需求曲线向左移动，直到经济利润为零。
3. What happens to the economic profits of a monopolistically competitive firm in the long run? (垄断竞争企业的经济利润在长期会发生什么？)
📖 点击查看答案Economic profits are competed away in the long run, so firms earn zero economic profit, breaking even at the point where demand is tangent to average total cost.
经济利润在长期被竞争消除，企业达到零经济利润，需求曲线与平均总成本曲线相切时企业盈亏平衡。
4. Why might a monopolistically competitive firm still earn profits in the long run despite the zero-profit prediction? (尽管模型预测零利润，为什么垄断竞争企业长期仍可能盈利？)
📖 点击查看答案By innovating to reduce costs or differentiating products through quality or advertising, firms can maintain a competitive advantage and sustain profits.
通过创新降低成本或通过质量和广告差异化产品，企业能够保持竞争优势并维持利润。
5. What is productive efficiency and does monopolistic competition achieve it? (什么是生产效率？垄断竞争市场能实现吗？)
📖 点击查看答案Productive efficiency means producing at the lowest average total cost. Monopolistic competition does not achieve productive efficiency due to excess capacity.
生产效率是指以最低平均总成本生产。垄断竞争由于存在产能过剩，无法实现生产效率。
6. Define allocative efficiency and compare its realization in perfect competition and monopolistic competition. (定义配置效率，并比较完全竞争和垄断竞争中的实现情况。)
📖 点击查看答案Allocative efficiency occurs when price equals marginal cost (P=MC), meaning resources are allocated to maximize consumer and producer surplus. Perfect competition achieves this; monopolistic competition does not, since P > MC.
配置效率是价格等于边际成本（P=MC），资源配置使消费者和生产者剩余最大化。完全竞争实现了配置效率，垄断竞争则没有，因为P > MC。
7. What is ‘excess capacity’ in the context of monopolistic competition? (垄断竞争中的“产能过剩”是什么意思？)
📖 点击查看答案Excess capacity means firms produce below the output level that minimizes average total cost, leading to inefficient resource use.
产能过剩指企业的产量低于平均总成本最小点对应的产量，导致资源利用效率低下。
8. How does product differentiation impact consumers in monopolistic competition? (产品差异化如何影响垄断竞争中的消费者？)
📖 点击查看答案It offers consumers a variety of choices tailored to different preferences, which may justify higher prices and improve consumer satisfaction.
产品差异化为消费者提供多样化选择，满足不同偏好，可能使较高价格合理化并提高消费者满意度。
📖 点击查看答案Because differentiated products better match their tastes, needs, or offer perceived unique benefits, increasing their willingness to pay a premium.
因为差异化产品更符合消费者的口味、需求或提供独特利益，提升了支付溢价的意愿。
10. What factors outside a firm’s control affect its profitability? (影响企业盈利能力的外部因素有哪些？)
11. Explain the role of innovation in maintaining long-term profits in monopolistic competition. (创新在垄断竞争中维持长期利润的作用是什么？)
📖 点击查看答案Innovation can reduce production costs or create superior products, enabling firms to differentiate and sustain profits despite market entry by competitors.
创新可以降低生产成本或创造更优产品，使企业通过差异化维持利润，抵御竞争者进入市场。
12. How does advertising influence monopolistically competitive firms’ demand? (广告如何影响垄断竞争企业的需求？)
📖 点击查看答案Advertising enhances perceived product differentiation, shifting the firm’s demand curve outward and allowing higher prices or sales volume.
广告强化产品差异化的感知，推动需求曲线外移，使企业能够实现更高价格或销售量。
13. What is the difference between marginal revenue (MR) and price (P) in monopolistic competition? (垄断竞争中边际收益和价格的区别是什么？)
📖 点击查看答案MR is less than P because to sell more units, the firm must lower the price on all units, causing MR to fall faster than price.
边际收益小于价格，因为增加销量需要对所有单位降价，导致边际收益下降速度快于价格。
14. Why does a monopolistically competitive firm not produce at the minimum average total cost? (垄断竞争企业为何不在平均总成本最低点生产？)
📖 点击查看答案Because of downward sloping demand and excess capacity, firms produce less than the efficient scale, prioritizing profit maximization over cost minimization.
由于需求曲线向下倾斜和产能过剩，企业产量低于有效规模，优先实现利润最大化而非成本最小化。
15. Describe the impact of rising input costs on all firms in a monopolistically competitive market. (投入成本上升对垄断竞争市场中所有企业的影响是什么？)
📖 点击查看答案Rising input costs increase average total costs for all firms, reducing profitability and potentially leading to higher prices or market exits.
投入成本上升提高了所有企业的平均总成本，降低盈利能力，可能导致价格上涨或部分企业退出市场。
16. What is the significance of the demand curve being tangent to the average total cost curve in the long run? (长期中需求曲线与平均总成本曲线相切有什么意义？)
📖 点击查看答案It marks the long-run equilibrium where the firm earns zero economic profit and cannot attract entry or exit from the market.
这是长期均衡点，企业实现零经济利润，市场不再有新的进入或退出。
17. How do entrepreneurs react to economic profits in monopolistic competition? (企业家如何对垄断竞争中的经济利润作出反应？)
📖 点击查看答案They are incentivized to enter the market, increasing competition and driving profits toward zero.
企业家因经济利润受到激励进入市场，增加竞争，促使利润趋近于零。
18. Explain why perfectly competitive firms are both productively and allocatively efficient in the long run. (解释为何完全竞争企业在长期内既实现生产效率又实现配置效率。)
📖 点击查看答案Because firms produce at minimum average total cost (productive efficiency) and price equals marginal cost (allocative efficiency).
企业以最低平均总成本生产（生产效率）且价格等于边际成本（配置效率）。
19. Can product differentiation lead to welfare improvements despite inefficiencies? Why? (产品差异化尽管导致效率低下，是否仍能改善福利？为什么？)
📖 点击查看答案Yes, because it provides variety and better matches consumer preferences, increasing consumer satisfaction despite some efficiency loss.
可以，因为产品多样性满足消费者多样化偏好，提升满意度，尽管伴随一定效率损失。
20. What is the role of ‘brand loyalty’ in sustaining profits for monopolistically competitive firms? (品牌忠诚度在维持垄断竞争企业利润中的作用是什么？)
📖 点击查看答案Brand loyalty reduces the elasticity of demand faced by the firm, allowing it to charge higher prices and maintain market power.
品牌忠诚降低企业面临的需求弹性，使其能够定价更高，维持市场势力。
21. How does the assumption of free entry and exit affect market dynamics in monopolistic competition? (自由进入和退出假设如何影响垄断竞争市场动态？)
📖 点击查看答案It ensures that profits are driven to zero in the long run, maintaining a balance between supply and demand.
保证长期利润被竞争消除，市场供需保持平衡。
22. Why is the marginal cost curve upward sloping? (为什么边际成本曲线是向上倾斜的？)
📖 点击查看答案Due to diminishing marginal returns, each additional unit costs more to produce after some output level.
由于边际报酬递减，超过一定产量后每增加一单位的成本上升。
23. How can firms in monopolistic competition differentiate their products? (垄断竞争企业如何进行产品差异化？)
24. What causes the demand curve for a firm’s product to be downward sloping in monopolistic competition? (什么原因导致垄断竞争中企业产品的需求曲线向下倾斜？)
📖 点击查看答案Because the firm faces competition but has some market power from product differentiation, making quantity demanded sensitive to price changes.
企业虽有竞争，但因产品差异化拥有一定市场权力，需求对价格变化敏感，故需求曲线向下倾斜。
25. How does economic profit differ from accounting profit? (经济利润与会计利润的区别是什么？)
📖 点击查看答案Economic profit accounts for both explicit and implicit costs (including opportunity costs), while accounting profit considers only explicit costs.
经济利润考虑显性成本和隐性成本（包括机会成本），会计利润只考虑显性成本。