When the coronavirus hit, investors weren't quite sure what to compare it to. Many used the 1918 Spanish Flu pandemic as their frame of reference, which served no one very well, says this week's guest on Master in Business, Jeremy Siegel, professor at the Wharton School of Business, advisor to Wisdom Tree and author of Stocks for the Long Run.

Initially, investors were complacent, as were America's leaders, amid talk that the infection was just another version of the common flu. That quickly shifted to fear that this could be like 1918, helping to create a radical overreaction. Amid shortages of disinfectants, face masks, gloves and other essentials, combined with an unprepared and botched response by the federal government, panic selling gripped the market, causing the March stock-market crash. Siegel laments the lack of leadership from the federal government, especially the Centers for Disease Control and Prevention.

Even if the S&P 500 Index earnings for 2020 were wiped out because of the coronavirus pandemic, the March decline was unwarranted, Siegel says. Assuming next year's earnings will look more like those of 2019 rather than 2020, the market should have fallen only 5% to 6%, not the 34% that marked the March low. This makes the market recovery seem more rational than many believe.

His favorite books are here; a transcript of our conversation is here.

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Next week, we speak with Ron Carson, founder and chief executive officer of Cwn LLC, which manages $7.5 billion.

This column was provided by Bloomberg News.