What happened to the stock market today?

Mar 9, 2020
On Wall Street’s most turbulent since the COVID-19 outbreak, a Harvard economist explains what’s going on.
A trader reacts on the floor of the New York Stock Exchange on Monday.
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Dow loses 1,200 points, bond yields tumble as oil crashes

Mar 9, 2020
The S&P 500 plunged as much as 7.4% in the first few minutes of trading, and losses were so sharp that trading was temporarily halted.
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What's behind some of the market volatility? Algorithms.

Mar 5, 2020
People don't buy and sell anymore. Computers do.
These days, computers and algorithms have replaced a lot of the action on the floor of the New York Stock Exchange.
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When and why it’s worth taking a look at equity index futures

Mar 4, 2020
They can indicate where the market is going to open, but they're not a crystal ball.
"I see an apple in a grocery store ..."
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Recent market volatility is more than just COVID-19

Mar 2, 2020
A trade war, the overvaluation of stocks and the 2020 election have also contributed to uncertainty.
Traders work during the opening bell at the New York Stock Exchange on Feb. 28, 2020 on Wall Street in New York City.
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Trump's stock market concern could make dealing with COVID-19 tough

Feb 26, 2020
Is that concern misplaced? A New York Times economics writer talks about it.
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For public good, not for profit.

Why sometimes big news does not move the stock market

Jan 7, 2020
Was it a predictable event? Then Wall Street's reaction might already be "priced in."
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What do changes in the stock market actually mean?

Oct 22, 2019
"It's not as simple as it might seem," said Andrea Eisfeldt of UCLA.
A trader exiting the floor of the New York Stock Exchange in April 2013.
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Why are the NYSE and private companies fighting over two-millionths of a second?

Oct 7, 2019
In the world of high-speed trading, a lot can happen in .000002 seconds.
Wall Street banks, brokers and traders will pay a lot to be first in trading changes. Above, the New York Stock Exchange seen in 2008.
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