Hi yyisme11, could you explain more, please?

Thanks again.

marginal benefit在不同时候不同对等，有时候MB等于MR(marginal revenue),有时候MB=MR-MC

比如，这道题。

You buy a ticket to a concert at a discount price of $50. You plan to take public transpirtation which cost $2. on the day of the concert, there is power failure, and the only way you can attend the concert is by taking a taxi,which costs $51, It is too late to try to sell your ticket.

should you pay for teh taxi and go to the concert? Exlain.

在这题里MB是你想获得的利益，也就等于你想为之付出的金钱，你想去听音乐会那么你原来的plan是$50的票钱加上你的车钱$2等于$52。

但是计划生变，你由于没有时间而必须要选择打车去音乐会了，这就增加了cost,这个就是Marginal cost. 而这个MC是50.

但，你的MB(52) 大于MC(50)，所以你还是获利的，所以应该选择打车去参加。

所以就是当MB>MC，获得利润，MB