Today, Apple AAPL +1.73% represents about 17% of the Nasdaq 100, but its effect on the markets seems to have an even greater impact on the direction of the Nasdaq 100. Since major market indices correlate to a high degree, the "Apple effect," in turn, has a significant influence on the other major market indices and raises the question, "Has Apple become the market?"
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(This article was also published in seekingalpha.com and townhall.com)