The premarket selloff in Apple Inc.'s stock can be blamed for nearly half the decline in Dow Jones Industrial Average futures. Apple shares slumped $3.50, or 3%, in the wake of fiscal fourth-quarter results reported after Tuesday's close. That would shave about 24 points off the price of the Dow, which is a price-weighted index. Dow futures were recently down 56 points. On the flip side, the $2.41, or 1.7%, rise in Boeing Co.'s stock after the company reported third-quarter results would provide about a 16-point support for the Dow.
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