Traders work on the floor of the New York Stock...

Traders work on the floor of the New York Stock Exchange Friday. The selloff in U.S. assets picked up steam as strong jobs data increased the likelihood the Federal Reserve will lift rates next month. Credit: Bloomberg / Michael Nagle

Stocks slumped Friday, and the market suffered its worst week in two years, as rising interest rates, fears of inflation and disappointing quarterly results from technology and energy giants spooked investors.

The Dow Jones industrial average dropped by nearly 666 points, or 2.5 percent.

Bond yields rose and contributed to the stock market swoon after the government reported Friday that wages grew last month at the fastest pace in eight years.

The Dow had its worst decline since June 2016, while the broader Standard & Poor’s 500 index had its biggest one-day percentage drop since September 2016.

“We’ve enjoyed low interest rates for so long, we’re having to deal with a little bit higher rates now,” said Darrell Cronk, head of the Wells Fargo Investment Institute.

The increase in bond yields hurts stocks in two ways: it makes it more expensive for companies to borrow money, and it also makes bonds more appealing to investors than riskier assets such as stocks.

Several major companies, including Exxon Mobil and Google’s parent company, Alphabet, sank after reporting weak earnings. Apple fell on concerns about iPhone sales.

The sharp decline in stocks this week short-circuited a robust start to the year that was spurred by strong global economic growth, solid company earnings and lingering enthusiasm for the GOP tax overhaul.

Even with the pullback, the major indexes are still up more than 3 percent this year.

The downturn also follows a long period of unprecedented calm in the market. Stocks haven’t had a pullback of 10 percent or more in two years, and hit their latest record highs just one week ago.

The S&P 500 fell 59.85 points, or 2.1 percent, to 2,762.13. The index has lost 3.9 percent since hitting a record high a week ago.

The Dow fell 665.75 points, to 25,520.96.

The Nasdaq slid 144.92 points, or 2 percent, to 7,240.95. The Russell 2000 index of smaller-company stocks gave up 32.59 points, or 2.1 percent, to 1,547.27.

While interest rates are still low by historical standards, meaning borrowing is still relatively cheap for businesses and people, they’ve been rising swiftly, and that’s what has markets on edge.

“The pace of rate increases is more important than the level,” said Nate Thooft, senior portfolio manager at Manulife Asset Management.

The increase in rates has been driven by the prospect of stronger economic growth, and higher inflation, in the U.S. and abroad.

Bond prices declined again Friday, pushing yields higher. The yield on the 10-year Treasury note, a benchmark for interest rates on many kinds of loans, including mortgages, climbed to 2.84 percent, the highest level in roughly four years. The rate was at 2.41 percent four weeks ago and 2.66 percent on Monday.

“Once we started going north of 2.5 percent, and you put that together with an overbought market, it had the ingredients of a sell-off, especially since January was so strong,” said Jeff Zipper, regional investment strategist at U.S. Bank Private Wealth Management.

The S&P 500, which many index funds track, soared 5.6 percent in January, its biggest monthly gain since March 2016.

The government’s latest job and wage data stoked inflation concerns.

U.S. employers added a robust 200,000 jobs in January, slightly above market expectations for an 185,000 increase. Meanwhile, average hourly pay rose 9 cents to $26.74, up 2.9 percent from a year earlier — the biggest gain since the recession ended eight years ago.

That’s good news for Main Street USA, but not for Wall Street.

“Everyone has been rooting for wage growth, but be careful what you wish for,” said Josh Wright, chief economist at recruiting software company iCIMS.

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