As Nvidia soars, the stock market’s deflated laggards spark concern MarketWatchNvidia stock accounts for more than a third of the S&P 500’s gains this year—and it’s a big risk for investors, top economist says FortuneI’m Not Saying Things Aren’t Crazy The Irrelevant InvestorHere’s Why The Economy Is Not As Strong As It Seems TheStreetWhen will the boom/bust rollercoaster end? FXStreet