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.
Timothy A. Clary/AFP via Getty Images

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.
Scott Heins/Getty Images

First, brokerages cut commissions. Now they may be bulking up.

Nov 21, 2019
Charles Schwab is reportedly in talks to buy rival TD Ameritrade. Merging could help make up for cutting trading fees to zero.
Charles Schwab is reportedly considering merging with TD Ameritrade.
Joe Raedle/Newsmakers

Rebalancing the S&P 500 means a whole lot of trades

Mar 15, 2019
Friday was one of the four times a year when the S&P 500 rebalances itself. This means that some stocks leave this index and some come in. This also means that all the indixes and exchange-traded funds that track the…
The New York Stock Exchange.
Spencer Platt/Getty Images

Hobby investments can't escape that darn global economy

Feb 13, 2019
Hobby investments are a fun alternative to the stock market. But they aren’t immune from the ebbs and flows of the economy.
The Beanie Baby craze in the '90s is an example of hobby investing.
Joyce Naltchayan/AFP/Getty Images

Five things to watch in trade in 2019

Dec 27, 2018
2018 was a busy year for U.S. trade policy and the 2019 outlook looks just as hectic.
New foreign cars are seen parked at the Dundalk Marine Terminal on March 9, 2018 in Baltimore, Maryland.
Mark Wilson/Getty Images

The origin of the holiday half day of trading on Wall Street

Nov 23, 2018
Federal law prohibits markets from being closed more than three consecutive days.
Spencer Platt/Getty Images

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Cryptocurrencies' collapse follows 2017 run, regulation threats

Nov 20, 2018
Down from its 1,400 percent rise in 2017, bitcoin is now trading at less than $5,000 — a sharp decline for what some once hoped was a new and promising asset that could excite institutional investors. Instead, many traders were…
In this photo illustration a visual representation of the digital currency Bitcoin sinks into water. 
Photo Illustration by Dan Kitwood/Getty Images

The Source Code: Brad Katsuyama

Sep 19, 2018
The former trader started his own stock exchange, IEX, to address his concerns about high-frequency trading.
IEX Group President and CEO Bradley Katsuyama, right, and Notre Dame finance professor Robert Battalio prepare to testify before the Senate Homeland Security and Governmental Affairs Investigations Subcommittee about high-speed stock trading in 2014.
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The business case for a stock market speed bump

Sep 19, 2018
A 350-millisecond delay can help long-term investors get equal footing with high-frequency traders, argues IEX's CEO.
Bradley Katsuyama, IEX Group president and CEO, testifies before the Senate Homeland Security and Governmental Affairs Investigations Subcommittee about high-speed stock trading in U.S. markets on Capitol Hill in 2014.
Chip Somodevilla/Getty Images