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Of course there isn't a causal relationship, but it seems as if there's at least a subtle correlation . In years following championships won by the Yankees, the U.S. GDP has grown at a 5% rate. By contrast, in years in which the Yankees didn't win a championship the economy grew at a 2.9% average whereas in years after they lost the Word Series the GDP grew at a 4% average. The explanation, even for differences so small, may simply result from the Yankees spending when times are good and so increasing their chances of success. This pattern is also helped by two periods when the Yankees were very successful and which coincided with robust GDP growth - in the period after WWII and in the late 1990's.
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