题目内容：
武汉黄鹤楼的入场券采取差别价格政策，国内游客的入场票价为2元，外国人的入场券为5元，试用经济理论分析：
（1）为什么采取差别价格？
（2）在怎样的条件下，施行这种政策才能有效？
参考答案：
选择题：武汉黄鹤楼的入场券采取差别价格政策,国内游客的入场票价为2元,外国人的入场券为5元,试用
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