On Thursday, U.S. stocks plunged to a loss that would’ve dwarfed any bad day in 2017, pivoted, then surged to pull off their first back-to-back gain in a month.

Just another crazy December day on Wall Street.

“Investors are becoming desensitized,” said Bryce Doty, senior vice president at Sit Investment Associates. “It’s like watching ‘Pulp Fiction.’ Halfway through, the violence doesn’t even bother you anymore.”

The latest Dow swing was only slightly bigger than the average up-and-down move last week, though back then equities were tumbling in the direction of a bear market. Strategists are starting to ask: if days like these are now normal, is there a context in which the whole three-month rout starts to feel routine?

A few research shops say yes, particularly if it ends -- as they believe it may -- right around here. Market turmoil that happens when the economy is holding up reminds Jim Kelleher, the director of research at Argus Research, of past stock declines that ended gently, he said in a note Thursday.

Unless evidence emerges of deep global growth erosion, what’s going on now “will prove to be shorter and more shallow than the declines experienced in ‘classic’ bear markets.”

Brutal days in the market are happening at a time gross domestic product is rising, interest rates are still low and earnings are solid. That could make this plunge a “check on valuation” rather than “the start of a long decline,” Kelleher wrote, acknowledging that investors have been more likely to focus on the negatives of the economy and market.

The U.S. economy expanded at 3.5 percent in the third quarter, and is expected to grow next year, though at a slower pace. Companies are posting record-breaking holiday sales, and consumption, which accounts for around 70 percent of the economy, rose more than forecast in November. The Institute for Supply Management index, a gauge of U.S. manufacturing, rose last month, with new orders picking up and companies adding workers.

“Investors are wondering if this will be a crash,” said Dave Campbell, a principal at San Francisco-based BOS, which manages around $4.2 billion. “The risks are there, but they’re always there. They’re more heightened but it’s not the most likely outcome. The economy continues to grow -- maybe a little more slowly -- but next year markets will have hit their lows and we’ll be on the rebound.”

Twenty percent declines in shares hardly assure a recession. In fact, only half of the 14 bear markets that took place since World War II occurred during a prolonged economic contraction, data compiled by LPL Research show. Sell-offs when the economy contracts are bad, with the S&P falling 37 percent on average. The ones that come when growth is positive level off at 24 percent.

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