Lofty US stocks leave investors punishing earnings disappointments By Reuters

By Lewis KrauskopfNEW YORK (Reuters) – Richly valued U.S. stocks are leaving investors with little tolerance for disappointment, raising the stakes ahead of a week in which two more technology and growth giants are set to report.Strong reports from Microsoft (NASDAQ:) and Google parent Alphabet (NASDAQ:) on Thursday helped propel the to its biggest weekly gain since early November following…