New York (CNN Business)Stocks fell sharply Monday, dragged down by reports that Apple's newest line of phones may not be selling as well as Apple or its investors had hoped. The Dow fell more than 500 points and the Nasdaq tumbled 2.8%. Apple's stock fell once more after the Wall Street Journal reported that Apple has cut orders for its iPhone XR, iPhone XS and iPhone XS Max. The new iPhones, which Apple unveiled in September, cost more than previous versions. The $749 iPhone XR is the least expensive new iPhone, but it costs $50 more than last year's cheapest...