For the week, however, stronger earnings reports have helped push the S&P 500 up 0.5 percent, extending its gains for the month to 1.4 percent. Amazon's stock slumped 11 percent in premarket trading after the online retail giant posted a wider loss than analysts had forecast. Orders for long-lasting manufactured goods rebounded in June, helped by rising demand for commercial aircraft and machinery. The Commerce Department said that orders for durable goods increased 0.7 percent last month.