We raised the annual fee on one of our cards from $95 to $150 this year. Monthly account closures have gone from 5,000 to 8,000, and about 50,000 accounts hit their renewal date each month. How would you tell whether the fee increase is driving the closures, and is the increase still worth it?

我们一张年费卡今年把年费从95美元涨到150美元。最近每月关户从5000个涨到了8000个，每月到续费日的账户大约5万个。你怎么判断关户增加是不是涨价造成的，这次涨价还划算吗？