But there is commercial logic, too: Spanish bonds, say, promise a nice return if you think the debt crisis will go no further.

但这里面也有商业的逻辑：如果你认为债务危机不会继续恶化，西班牙债券将会有一个很好的回报。

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So, you see, even though stocks have produced a nice return over time, they can clobber you for extended periods.

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And because it has the data to know when impressions are likely to get the most performance, it can generate a nice return.

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But there is commercial logic, too: Spanish bonds, say, promise a nice return if you think the debt crisis will go no further.

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