Shortly after the market open, the Dow Jones Industrial Average and the S&P 500, which both closed at record highs Monday, climbed about 0.3% and 0.1%, respectively, while the tech-heavy Nasdaq fell about 0.3%. In his annual note to shareholders, billionaire JPMorgan CEO Jamie Dimon said Wednesday that although stock valuations are "quite high by almost all measures," an expected economic boom could justify the prices, echoing the sentiment among big banks Goldman Sachs and Morgan Stanley, which have recently touted the impending recovery.
