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A customer tells him that she thinks a chunk of ice might have hit her car.

一个顾客说她认为可能有一块相当厚的冰块击中她的车子。

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The more a customer uses the product, the more value she derives, the higher the switching costs are, and at some point she’ll hit a usage limit and convert to a paying customer.

有越多的顾客使用这个产品，它就能产生越多的价值，而转移成本也会变得越高，而在某一点处，它会达到一个使用限制，用户想要突破这一限制就必须付出一定的费用。

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Capital One said its Venture card offer to match up to 100, 000 miles per customer hit one billion miles in just 25 days.

WSJ: Card Tricks Win Big Rewards for Some Travelers

So how do you know if your best supplier or customer is about to hit the skids?

FORBES: Small Biz Bum Alert

Otherwise, the customer acquisition treadmill will hit diminishing returns very early on.

FORBES: New Rules For E-Commerce