A Wall Street investment chief warns new stock-market highs could be setting up a 'historic trap' for investors — one that also appeared just before the dot-com crash

· The lofty valuations of big technology companies at the forefront of the stock market's rally could short-circuit the next all-time high, according to Doug Ramsey, the chief investment officer at The Leuthold Group.
· He showed two historical analogs that saw stocks came within 2% of their record high before rolling over...