The largest U.S. labor strike in a decade is starting to ripple through the economy, with the potential to weaken data on manufacturing and jobs that economists are scrutinizing for signs of a recession.

Now in its fourth week, the walkout of 48,000 General Motors workers has forced the shutdown of 34 plants across the U.S. That is already showing up in weekly jobless claims and will lower the Labor Department’s payroll figures for October, according to economists. It may also weigh on the monthly manufacturing surveys and production numbers. The biggest, and hardest to predict, is the risk of spillover into consumer confidence and spending, which accounts for nearly three-quarters of growth.

The effects of the walk-off are exacerbated in an economy already facing systemic issues, including slowing manufacturing as companies step down investment amid uncertainty caused by the U.S.-China trade war and global slump. While economists expect the strike’s impact to be temporary, deterioration in economic reports would create challenges for forecasters who see a 35% chance of recession over the next 12 months.

“It’s a vulnerable picture and the strike adds to the bucket of risks and volatility that the consumer is looking at,” said Julia Coronado, president of MacroPolicy Perspectives LLC, an independent research firm. “The risks are just stacking up and when you get an accumulation of risks stacking up, sometimes they can feed on each other.”

In an effort to end the strike, the automaker this week boosted its offer to the United Auto Workers union by about $2 billion, pledging $9 billion of investment in U.S. plants, according to a person familiar with the matter.

Effects of the strike could also create noise in the data that’s “going to make it harder to get a sense of how the manufacturing sector is holding up,” said Sarah House, senior economist at Wells Fargo & Co. “It could make it hard to determine how much momentum the economy is losing right now.”

The clearest impact so far is in the labor market: The striking workers make up only about 0.03% of total employment in the U.S. but may have played a role in bumping up jobless claims for three straight weeks. Claims rose in states most reliant on auto production including Michigan, Tennessee, and Indiana, though benefit filings declined nationally in the most recent week. While most state laws prevent striking workers from getting unemployment benefits, they can still file, which is reflected in the count.

As a result of the stoppage, more than 100 of GM’s suppliers have laid off as many as 12,000 of their own workers, including truckers, parts makers, and suppliers, according to the Original Equipment Suppliers Association, an industry trade group. Less tangible is the slowed business at local restaurants, retailers, and cafes.

While total car production makes up only about 0.8% of gross domestic product -- and GM accounts for about a fifth of that -- the strike likely reduced manufacturing output by 0.4 percentage point last month and may have a similar impact in October, according to Capital Economics. As a result, factory output probably declined 0.5% in September from the prior month, the group said in a research note.

“Cuts in this sector will likely continue to rise, especially if the strike at General Motors continues and the fallout impacts suppliers,” wrote Joshua Shapiro, economist at the research firm MFR.

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