(Friday, March 20, 2020, 9:15 p.m. ET) - With the stock market plunging more than 30% from an all-time high five weeks ago, what's an investor to think? The answer says more about the nature of the stock market than about the Coronavirus crisis.

Most individual investors have managed their retirement accounts through the global financial crisis of 2008, and maybe even through the tech bubble's burst in 2000. Baby boomers, nearing or recently retired, remember Black Monday, October 19, 1987.

While past performance is not a guarantee of your future results, the virus crisis is just the latest of many market crashes in recent decades to many investors in the stock market, and, so far, they appear to have have concluded, Covid-19, too, shall pass.