Businesses are forcing hundreds of thousands of people into part-time roles in what could be an early warning sign for the economy.

• The number of people who worked part time, but want to work full time, rose by 452,000 in June, the biggest jump in more than three years.
• “I don’t mean to be Chicken Little here, but this does tend to be a leading indicator that things are starting to slow down,” says a former deputy director at the Labor Department.

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