BIG MAC's role in Economics

你知道吗？McD 的Big Mac Burger 不仅是大家喜爱的快餐，它的价钱也用来做于 the indication of exchange rates. If you buy Big Mac in Malaysia at RM5.50 while in Singapore is S$3.60, 那么，你就能知道singapore and Malaysia 的兑换率。。。
为何BIGMAC 呢？因为世界各地都可吃到它，所以经济学家就用它的价钱来做和现实市场兑换率 来做比较。。

如果Big Mac in Malaysia at RM5.50 while in Singapore is S$3.60, 那么，singapore and Malaysia 的兑换率是 S$1 = RM1.53
但是在兑换市场 (FOREX ) 却是 S$1 = RM2.1

这么来说， Malaysia's currency in FOREX has been undervalued...