Stocks are unlikely to retest bear market lows and there's too much pessimism about the US economy, market veteran Ed Yardeni says

• There's too much pessimism about the US economy, says Ed Yardeni at Yardeni Research. 
• He told CNBC that investors may have missed out if they ditched stocks after Jamie Dimon sounded alarms about an economic "hurricane".
• The S&P 500 has risen about 19% since hitting a bear-market low in October. 

Investors may miss out on potential stock market gains if they grow too wary about the US economy, which is likely to avoid an outright recession, said Wall Street veteran Ed Yardeni as the S&P 500 inched closer to entering a bull market.