Dow plunges 675 points in final 20 minutes of trading—and it's still a decent day on Wall Street

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      It was another see-saw day on the New York Stock Exchange.

      On the whole, it wasn't too bad for investors, with the index of 30 Dow stocks closing up 2.39 percent over the previous' days close.

      One stock, Boeing Co., posted a stunning 24.32 percent gain, closing up $31.05 to end the day at $158.73.

      Another significant gainer was United Technologies Corp., up 10.87 percent to close at $96.19. Nike Inc. rose 9.24 percent percent to close at $79.01.

      But there was one cause for concern: a 675-point drop in the final 20 minutes of trading before the closing bell.

      It's yet another sign of the volatility that's been plaguing stock markets ever since the COVID-19 crisis arrived on North American shores.

      The Dow closed at 21,200.55—up 495.64 points from the Wednesday (March 24) close. And it was the highest closing number since St. Patrick's Day.

      But the benchmark index is still 6,342 points below February's record high, which means it's still technically a bear market.

      The average length of a bear market is 299 days, according to Hartford Funds, so it's far too early to say if the recent downturn has hit its nadir.

      But the fact that stocks are staging a minor recovery in the midst of the COVID-19 pandemic suggests that many big money managers aren't spooked by the markets.

      They're keeping their cool even as New York has emerged as the epicentre of the North American coronovirus pandemic and as some of those very same money managers are practising social isolation.

      That's a far cry from the beginning of March, when many were suggesting that traders had lost their nerve.