老师让以下面的问题为中心写论文，尽量用到所有的微观经济学原理，拜托帮忙想想有哪些呢？

1、Why the mainland tourists prefer to have their luxury shopping in HongKong, despite the fact that these luxury stores are also located in many Chinese Cities?
2 The trend that more luxury and fashion brands have opened their regional headquarters in HongKong than any other Asian cities outside Japan in recent years?


我能想到的就是 机会成本， 弹性，还有市场效率...