REUTERS/Luke MacGregor
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Economist David Rosenberg is warning that the S&P 500 is due for lackluster returns this year.
He said the S&P 500's most expensive stocks could see a median 30% drop, like in the dot-com bubble.
He laid out in several charts how extreme investor euphoria has become.
Investor euphoria has seemed to reach a particular level of bizarreness this year.
Stock indices are at all-time-highs despite an uneven economic recovery and the risk that new strains of COVID-19 may prolong the global pandemic.