The S&P 500, Dow Jones and Nasdaq all entered correction territory on Thursday, down 10% from their recent record highs amid a global market rout that began earlier this week following a spike in the coronavirus cases around the world.

The big picture: Stocks fell more than 3% for a time on Thursday morning, extending the market’s worst week since the financial crisis in 2008, according to CNBC.

The stock market selloff has drawn the most attention this week, but moves in the U.S. government debt market will likely have much more important impacts on the economy.

The state of play: Mass bond buying has taken place since the beginning of the year and picked up steam as headlines about the spread of novel coronavirus have grown more worrisome.

Economists are rethinking projections about the broader economic consequences of the coronavirus outbreak after a surge of diagnoses and deaths outside Asia and an announcement from a top CDC official that Americans should be prepared for the virus to spread here.

What's happening: The coronavirus quickly went from an also-ran concern to the most talked-about issue at the National Association for Business Economics policy conference in Washington, D.C.

The Treasury held an incredibly weak auction of 2-year government debt Tuesday that saw primary dealers, who are essentially on clean-up duty, take home their highest share of the auction since December 2018.

What it means: Even though yields on the 2-year note have fallen by nearly 40 basis points this year, traders are convinced that there is "certainly more room for yields to fall," Ben Jeffery, rates analyst at BMO Capital Markets, tells Axios.

When President Trump launched the U.S. into a trade war in 2018, many fund managers argued that small-cap stocks were poised to outperform because their business would be immune to tariffs and uncertainty.

What's happening: They did well over the course of that year but after Tuesday's 3.5% decline, the Russell 2000 index, which tracks many of the nation's small public companies, has fallen to near its closing level from February 2018.

The stock market fell another 3% on Tuesday, following Monday’s sell-off. Bond yields touched record lows.

The big picture: Stocks continued to fall as the CDC said it expects the coronavirus to spread in the U.S. The Dow and S&P are more than 7% below the record highs seen earlier this month.

Bernie Sanders is poised to become an economic scapegoat for both the White House and Corporate America, assuming that Sanders comes through Super Tuesday unscathed.

The big picture: If the U.S. economy remains strong, President Trump and CEOs will claim credit (as they've been doing for three years). If it turns sour, they'll blame Bernie (even though it's a largely baseless charge).

Shares of the newly-combined ViacomCBS dropped a startling 15% last week, after the company announced plans for a new streaming service during its first earnings report as a combined entity.

Why it matters: The company is now worth far less combined ($17 billion in market capitalization) than the two companies were worth separately (around $30 billion) prior to their merger.

As someone has certainly told you by now, the Dow fell by more than 1,000 points yesterday, its worst day in more than two years, erasing all of 2020's gains. Most news headlines assert that the stock market's momentum was finally broken by "coronavirus fears," but that's not the full story.

What's happening: The novel coronavirus has been infecting and killing scores of people for close to a month and, depending on the day, the market has sold off or risen to record highs.

Wall Street had its worst day in two years on Monday, following a spike in coronavirus cases in South Korea and Italy. The S&P 500 fell 3.3%, the Nasdaq Composite fell 3.7% and the Dow Jones Industrial Average sunk 1,030 points (3.5%).

The big picture: This is the U.S. stock market's biggest reaction thus far to the coronavirus, largely shrugging it off as a threat to the global economy (though the bond market has not). While the S&P is down from record highs — which it notched last week — the index is still above lows touched earlier this year.