Wall Street shakes off Amazon, Apple weakness to end modestly higher
* $Apple$, Amazon fall on dismal holiday-quarter forecast. * $Microsoft$ tops Apple as the most valuable U.S. public company. The S&P 500 had fallen as much as 0.65% earlier in the day. The benchmark index advanced 1.3% for the week, its fourth straight weekly climb, marking its longest weekly streak of gains since April. For the month, the S&P rose 6.9%, its biggest monthly rise since November 2020.The Dow rose 0.4% for the week while the Nasdaq gained 2.7%, also marking four straight weekly ga