Durable Incrementality
南方周末：在这些关键时间点，都发生了什么具体的事情？
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Apple offers great ways to save on the latest iPad. Customers can trade in their current iPad and get credit toward a new one by visiting the Apple Store online, the Apple Store app, or an Apple Store location. To see what their device is worth, and for terms and conditions, customers can visit apple.com/shop/trade-in.
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So how do we keep the power without the syntax tax?