NEW YORK — It was another miserable day on Wall Street as a series of big December plunges continued, putting stocks on track for their worst month in a decade.

The Dow Jones Industrial Average dropped 464 points Thursday, bringing its losses to more than 1,700 points since last Friday.

A television screen at the New York Stock Exchange relays the news that the Federal Reserve Board announced a rate increase Wednesday. The market responded with a two-day selloff of U.S. stocks. Associated Press/Mark Lennihan

The benchmark S&P 500 index has slumped 10.6 percent this month and is almost 16 percent below the peak it reached in late September.

The S&P 500 index skidded 39.54 points, or 1.6 percent, to 2,467.42. The Dow fell 464.06 points, or 2 percent, to 22,859.60 after sinking as much as 679.

The Nasdaq fell 108.42 points, or 1.6 percent, to 6,528.41. The Russell 2000 index of smaller companies dropped another 23.23 points, or 1.7 percent, to 1,326.

The steady gains of last spring and summer now feel like a distant memory. Entering the fall, investors started to worry that global economic growth was cooling off and that the U.S. could slip into a recession in the next few years. The S&P 500 is on track for its first annual loss in a decade.

The technology stocks that have led the market in recent years are now dragging it down. The technology-heavy Nasdaq composite is now down 19.5 percent from the record high it reached in August.

The market swoon is coming even as the U.S. economy is on track to expand this year at the fastest pace in 13 years. Markets tend to move, however, on what investors anticipate will happen well into the future, so it’s not uncommon for stocks to sink even when the economy is humming along.

Right now, markets are concerned about the potential for a slowing economy and two threats that could make the situation worse: the ongoing trade dispute between the U.S. and China, which has lasted most of this year, and rising interest rates, which act as a brake on economic growth by making it more expensive for businesses and individuals to borrow money.

The selling in the last two days came after the Federal Reserve raised interest rates for the fourth time this year and signaled it was likely to continue raising rates next year, although at a slower rate than it previously forecast.

Scott Wren, senior global equity strategist at Wells Fargo Investment Institute, said investors felt Fed Chairman Jerome Powell came off as unconcerned about the state of the U.S. economy, despite deepening worries on Wall Street that growth could slow even more in 2019 and 2020. Wren said investors want to know that the Fed is keeping a close eye on the situation.

“He may be a little overconfident,” Wren said. “The Fed needs to be paying attention to what’s going on.”

Powell also acknowledged that the Fed’s decisions are getting trickier because they need to be based on the most up-to-date figures on jobs, inflation, and economic growth. For the last three years, the Fed told investors weeks in advance that it was almost certain to increase rates. But things are less certain now, and the market hates uncertainty.

Treasury Secretary Steven Mnuchin said the market’s reaction to the Fed was “completely overblown.”

Investors have responded to a weakening outlook for the U.S. economy by selling stocks and buying ultra-safe U.S. government bonds. The bond-buying has the effect of sending long-term bond yields lower, which reduces interest rates on mortgages and other kinds of long-term loans.

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