Second, this correlation holds true with no exceptions.

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In other words, not only can you find low-correlation sector pairings to provide true diversification, they allow for a granularity in risk management that is unavailable in traditional equity strategies.

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The correlation between money and popularity is true, Elberse says, not only for Hollywood blockbusters, but even for much more mundane products, like bicycles.

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True, it is hard to find a clear correlation between overall aid flows on the one hand, and economic growth or reductions in poverty on the other.

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That can be true, Mr. Simons says, whether or not a correlation is driven by fundamental economic factors.

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