一个经济中没有任何中央计划或政府管制，所有经济活动都由个体消费者和企业按照自身的利益来决定，那么这个经济称为：
A. 命令经济
B. 自由放任经济
C. 看不见的手的经济
D. 私有经济
查看答案
二手车的价格远低于新车是因为：Used cars sell for much less than new cars because
A. 因为汽车产业的市场不是完全竞争市场。of imperfect competition in the automobile industry.
B. 买家比卖家更清楚二手车的质量情况 buyers know much more about the quality of used cars than sellers do.
C. 卖家比买家更清楚二手车的质量情况sellers know much more about the quality of used cars than buyers do.
D. 汽车的物理折旧非常高 physical depreciation of used cars is very high.
隔壁老王是一位40多岁的男人，他吸烟嗜酒，超重，不爱运动，还经常参加一些冒险的活动，由于在医疗保险领域的逆向选择问题，那么John is a 55-year-old male smoker, about 50 pounds overweight, who has high blood sugar and drinks to excess a couple of times each month. Because of adverse selection in health insurance,
A. 比起大多数人，老王不太可能购买医疗保险。John is less likely to buy health insurance than the average person, because the average person's policy premiums will be based on his risk, not the average risk.
B. 比起大多数人，老王更可能购买医疗保险。John is more likely to buy health insurance than the average person, because his policy premiums will be based on the average risk, not his personal risk.
C. 老王购买医疗保险的可能性，与大多数人相同。
D. 其他均不对
当卖家拥有关于产品的信息多于买家，我们可以预计在最终市场达到相对稳定状态时：When sellers have more information about products than buyers do, we would expect
A. 卖家能够用高质量产品的价格售卖低质量产品 sellers to get higher prices for their goods than they could otherwise.
B. 买家能够用低质量产品的价格购买高质量产品 buyers to pay lower prices for goods than they would otherwise.
C. 高质量产品将低质量产品挤出市场 high-quality goods to drive low-quality goods out of the market.
D. 低质量产品将高质量产品挤出市场 low-quality goods to drive high-quality goods out of the market.
作为市场信号的卖家保证将会更加有价值，当 A warranty is most valuable as a signaling device when
A. 买家比卖家拥有更多的产品信息 the buyer has much more information about the product than the seller does.
B. 卖家比买家拥有更多的产品信息 the seller has much more information about the product than the buyer does.
C. 买家比卖家更了解自身的喜好 the buyer has much more information about his or her own preferences than the seller does.
D. 卖家和买家都不太了解产品 neither the buyer nor the seller has good information about the product.
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