需求收入弹性可能是负数

答案：答案：是的，需求收入弹性可能是负数。需求收入弹性（Income Elasticity of Demand）衡量的是消费者...

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Which statement about altruism is correct?( ) A. It seems clear that groups with the greatest number of altruistic individuals are best able to survive.
答案：答案：B. It is not always true that groups with the greatest nu...
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Which statement about altruism is correct?( ) A. It seems clear that groups with the greatest number of altruistic individuals are best able to survive. B. Present-day evolutionary theory recognizes
答案：答案：A 解析：选项A正确，因为利他主义行为在某些情况下可以增强群体的生存能力。在群体选择理论中，如果一个群体...