1. What does price elasticity of demand measure? (需求价格弹性衡量的是什么？)
📖 点击查看答案It measures the responsiveness of quantity demanded to a change in price.
它衡量的是需求量对价格变化的反应程度。
2. How do we calculate price elasticity of demand using the midpoint formula? (如何使用中点公式计算需求价格弹性？)
📖 点击查看答案Price Elasticity of Demand = (Percentage change in quantity demanded) / (Percentage change in price), using the average of initial and final values.
需求价格弹性 = (需求量的百分比变化) / (价格的百分比变化)，使用初始值和最终值的平均值进行计算。
3. What does it mean if demand is elastic? (如果需求是有弹性的，这意味着什么？)
📖 点击查看答案It means that the quantity demanded is highly responsive to price changes (elasticity > 1).
这意味着需求量对价格变化非常敏感（弹性系数大于1）。
4. What does it mean if demand is inelastic? (如果需求是无弹性的，这意味着什么？)
📖 点击查看答案It means that the quantity demanded is not very responsive to price changes (elasticity < 1).
这意味着需求量对价格变化不太敏感（弹性系数小于1）。
5. What happens to total revenue when demand is elastic and price decreases? (当需求是有弹性的且价格下降时，总收入会发生什么变化？)
📖 点击查看答案Total revenue increases because the percentage increase in quantity demanded is greater than the percentage decrease in price.
总收入增加，因为需求量的百分比增长大于价格的百分比下降。
6. What happens to total revenue when demand is inelastic and price decreases? (当需求是无弹性的且价格下降时，总收入会发生什么变化？)
📖 点击查看答案Total revenue decreases because the percentage decrease in price is greater than the percentage increase in quantity demanded.
总收入减少，因为价格的百分比下降大于需求量的百分比增长。
7. What is unit elastic demand? (什么是单位弹性需求？)
📖 点击查看答案Unit elastic demand occurs when the percentage change in quantity demanded is equal to the percentage change in price (elasticity = 1).
单位弹性需求是指需求量的百分比变化等于价格的百分比变化（弹性系数等于1）。
8. What does a perfectly elastic demand curve look like? (完全弹性的需求曲线是什么样的？)
📖 点击查看答案A perfectly elastic demand curve is a horizontal line, indicating that consumers will only buy at one price.
完全弹性的需求曲线是一条水平线，表示消费者只会在某个固定价格购买商品。
9. What does a perfectly inelastic demand curve look like? (完全无弹性的需求曲线是什么样的？)
📖 点击查看答案A perfectly inelastic demand curve is a vertical line, indicating that quantity demanded does not change regardless of price changes.
完全无弹性的需求曲线是一条垂直线，表示无论价格如何变化，需求量都不会改变。
10. What are the main determinants of price elasticity of demand? (需求价格弹性的主要决定因素是什么？)
📖 点击查看答案1. Availability of substitutes
2. Passage of time
3. Whether the good is a necessity or luxury
4. Definition of the market
5. Share of the good in consumer’s budget
6. 替代品的可获得性
7. 时间推移
8. 该商品是必需品还是奢侈品
9. 市场定义的范围
10. 该商品在消费者预算中的占比
11. How does the availability of substitutes affect price elasticity? (替代品的可获得性如何影响需求价格弹性？)
📖 点击查看答案The more substitutes available, the higher the price elasticity of demand.
替代品越多，需求的价格弹性越高。
12. How does the passage of time affect price elasticity? (时间推移如何影响需求价格弹性？)
📖 点击查看答案Over time, consumers adjust their behavior, making demand more elastic in the long run.
随着时间推移，消费者会调整行为，使得需求在长期内更具弹性。
13. How does whether a good is a luxury or a necessity affect its price elasticity? (商品是奢侈品还是必需品如何影响价格弹性？)
📖 点击查看答案Luxuries tend to have higher price elasticity, while necessities tend to have lower price elasticity.
奢侈品通常具有较高的价格弹性，而必需品的价格弹性较低。
14. How does the definition of a market affect price elasticity? (市场定义如何影响需求价格弹性？)
📖 点击查看答案A narrowly defined market (e.g., vanilla ice cream) tends to have more elastic demand than a broadly defined market (e.g., ice cream in general).
狭义市场（如香草冰淇淋）的需求通常比广义市场（如冰淇淋）的需求更具弹性。
15. How does the share of a good in a consumer’s budget affect price elasticity? (商品在消费者预算中的占比如何影响需求价格弹性？)
📖 点击查看答案Goods that take up a larger share of a consumer's budget tend to have higher price elasticity.
占消费者预算较大比例的商品通常具有较高的价格弹性。
16. What happens to price elasticity of demand when a good has fewer substitutes? (当商品的替代品较少时，需求价格弹性会发生什么变化？)
📖 点击查看答案Price elasticity of demand decreases because consumers have fewer alternatives.
需求价格弹性降低，因为消费者可选择的替代品较少。
17. Why is demand more elastic in the long run than in the short run? (为什么长期需求比短期需求更具弹性？)
📖 点击查看答案Consumers have more time to find substitutes or change consumption habits.
消费者有更多时间寻找替代品或改变消费习惯。
18. What is total revenue? (什么是总收入？)
📖 点击查看答案Total revenue is the total amount of money a firm receives from selling a good or service, calculated as Price × Quantity.
总收入是企业通过销售商品或服务获得的总金额，计算公式为价格 × 数量。
19. How does total revenue change when demand is unit elastic? (当需求是单位弹性时，总收入如何变化？)
📖 点击查看答案Total revenue remains constant when price changes.
当价格变化时，总收入保持不变。
20. What type of demand curve has a constant price elasticity of demand equal to 1? (哪种需求曲线的需求价格弹性恒等于1？)
📖 点击查看答案A unit elastic demand curve.
单位弹性需求曲线。
21. How does a steep demand curve affect price elasticity? (陡峭的需求曲线如何影响价格弹性？)
23. What is the price elasticity of demand for a perfectly inelastic good? (完全无弹性商品的需求价格弹性是多少？)
📖 点击查看答案Zero (0).
零 (0)。
24. What is the price elasticity of demand for a perfectly elastic good? (完全弹性商品的需求价格弹性是多少？)
📖 点击查看答案Infinity (∞).
无限大 (∞)。
25. If the price of gasoline decreases from 2.50to2.30 and quantity demanded increases from 2000 to 2500 gallons, how do you calculate price elasticity? (如果汽油价格从2.50降至2.30，而需求量从2000加仑增加到2500加仑，如何计算需求价格弹性？)
📖 点击查看答案Using the midpoint formula:
Elasticity = (% change in quantity) / (% change in price)
需求价格弹性 = (需求量的百分比变化) / (价格的百分比变化)。
26. What happens if price elasticity of demand is greater than 1? (如果需求价格弹性大于1，会发生什么？)
📖 点击查看答案Demand is elastic, meaning consumers respond significantly to price changes.
需求是有弹性的，意味着消费者对价格变化反应较大。
27. What happens if price elasticity of demand is less than 1? (如果需求价格弹性小于1，会发生什么？)
📖 点击查看答案Demand is inelastic, meaning consumers do not respond significantly to price changes.
需求是无弹性的，意味着消费者对价格变化反应较小。
28. How does a necessity good’s demand react to price changes? (必需品的需求如何对价格变化做出反应？)
📖 点击查看答案Necessities have low price elasticity, meaning demand does not change much with price changes.
必需品的价格弹性较低，意味着需求不会因价格变化而大幅波动。
29. How does a luxury good’s demand react to price changes? (奢侈品的需求如何对价格变化做出反应？)
📖 点击查看答案Luxuries have high price elasticity, meaning demand changes significantly with price changes.
奢侈品的价格弹性较高，意味着需求会随着价格变化而大幅波动。
30. Why do broadly defined markets tend to have inelastic demand? (为什么广义市场的需求通常是无弹性的？)
📖 点击查看答案Because there are fewer substitutes available.
因为可供选择的替代品较少。
31. Why do narrowly defined markets tend to have elastic demand? (为什么狭义市场的需求通常是有弹性的？)
📖 点击查看答案Because there are more substitutes available.
因为可供选择的替代品较多。
32. What happens to total revenue when demand is elastic and price increases? (当需求是有弹性的且价格上升时，总收入会发生什么变化？)
📖 点击查看答案Total revenue decreases because the decrease in quantity demanded outweighs the increase in price.
总收入减少，因为需求量的下降幅度大于价格的上升幅度。
33. What happens to total revenue when demand is inelastic and price increases? (当需求是无弹性的且价格上升时，总收入会发生什么变化？)
📖 点击查看答案Total revenue increases because the decrease in quantity demanded is smaller than the increase in price.
总收入增加，因为需求量的下降幅度小于价格的上升幅度。
34. What is the relationship between demand curve slope and price elasticity? (需求曲线的斜率与价格弹性之间的关系是什么？)
36. What is cross-price elasticity of demand? (需求的交叉价格弹性是什么？)
📖 点击查看答案Cross-price elasticity of demand measures how the quantity demanded of one good responds to a change in the price of another good.
需求的交叉价格弹性衡量一种商品的需求量对另一种商品价格变化的反应程度。
37. How does cross-price elasticity of demand indicate whether goods are substitutes or complements? (交叉价格弹性如何判断商品是替代品还是互补品？)
📖 点击查看答案If the cross-price elasticity is positive, the goods are substitutes; if it is negative, they are complements.
如果交叉价格弹性为正值，商品是替代品；如果为负值，商品是互补品。
38. What is income elasticity of demand? (需求的收入弹性是什么？)
📖 点击查看答案Income elasticity of demand measures how the quantity demanded of a good responds to a change in consumer income.
需求的收入弹性衡量消费者收入变化对商品需求量的影响程度。
39. How does income elasticity of demand classify normal and inferior goods? (收入弹性如何区分正常品和劣等品？)
📖 点击查看答案If the income elasticity is positive, the good is a normal good; if it is negative, the good is an inferior good.
如果收入弹性为正值，商品是正常品；如果为负值，商品是劣等品。
40. Why is price elasticity of demand different in the short run and long run? (为什么价格弹性在短期和长期不同？)
📖 点击查看答案In the short run, consumers have less time to adjust, making demand more inelastic. In the long run, they can find alternatives, making demand more elastic.
在短期内，消费者调整的时间较少，使需求更缺乏弹性。在长期内，他们可以找到替代品，使需求更具弹性。
41. How does government price control affect price elasticity of demand? (政府价格管制如何影响需求的价格弹性？)
📖 点击查看答案Price controls, such as price ceilings and floors, can distort market equilibrium and affect how consumers respond to price changes.
价格管制（如最高价和最低价）会扭曲市场均衡，影响消费者对价格变化的反应。
42. Why do businesses analyze price elasticity when implementing sales promotions? (企业在进行促销时为何要分析价格弹性？)
📖 点击查看答案For elastic demand, lowering prices increases total revenue, making promotions effective. For inelastic demand, price cuts reduce total revenue.
对于弹性需求，降价会增加总收入，使促销更有效。对于无弹性需求，降价反而会减少总收入。
43. How does price elasticity of demand influence government taxation policies? (需求价格弹性如何影响政府的税收政策？)
📖 点击查看答案Governments tax inelastic goods more because consumers continue buying them despite price increases, ensuring stable tax revenue.
政府倾向于对无弹性商品征税，因为即使价格上涨，消费者仍会继续购买，从而保证税收稳定。
44. Why is gasoline considered inelastic in demand? (为什么汽油被认为是无弹性的？)
📖 点击查看答案Because there are few immediate substitutes, and consumers rely on it for essential activities, so demand changes little with price.
因为汽油几乎没有直接替代品，而且消费者需要它来满足基本出行需求，因此价格变化对需求影响较小。
45. How do luxury and necessity goods differ in terms of price elasticity? (奢侈品和必需品在价格弹性上有何不同？)
📖 点击查看答案Luxury goods have elastic demand, meaning a price increase reduces quantity demanded significantly. Necessities have inelastic demand.
奢侈品的需求富有弹性，价格上涨会导致需求量大幅减少。必需品的需求缺乏弹性。