WASHINGTON, USA

THE drop in the unemployment rate in August to a 4 1/2-year low was hardly cause for celebration. The rate fell because more people stopped looking for work.

More than 300,000 people were no longer working or looking for a job. Their exodus shrank the so-called labour force participation rate — the percentage of adult Americans with a job or seeking one — to 63.2 per cent. It’s the lowest participation rate since August 1978.

Once people without a job stop looking for one, the government no longer counts them as unemployed. That’s why the unemployment rate dropped to 7.3 per cent in August from 7.4 per cent in July even though 115,000 fewer people said they had jobs.

If those who left the labour force last month had still been looking for work, the unemployment rate would have risen to 7.5 per cent in August.

“Pretty disappointing,” said Beth Ann Bovino, US chief economist at Standard & Poor’s Ratings Services. “You saw more people leave the job market and fewer people get jobs. Not a good sign.”

Back in 2000, the participation rate hit a high of 67 per cent. At the time, women were pouring into the labor force. But women’s participation fell modestly through the mid-2000s — then dropped sharply from late 2009 through 2013.

Women’s participation rate was 57 per cent last month, down from a peak of 60 per cent in 2000.

For men, the participation rate fell last month to just below 70 per cent — its lowest point on records dating to 1948. Men’s participation peaked in 1949 at 87 per cent and has declined gradually in the decades since.

In a 2011 report, the Congressional Budget Office noted that the recent drop in women’s participation was particularly steep among those with dependent children and well-educated women married to high-earning men.

Another factor in the declining participation is that the oldest baby boomers have reached retirement age.

But Craig Alexander, chief economist at TD Bank Group, says “demographics cannot explain the amount of decline” in labour force participation.

Many Americans without jobs remain so discouraged that they’ve given up on the job market. Others have retired early. Younger ones have enrolled in school.

Some Americans have suspended their job hunt until the employment landscape brightens. A rising number are collecting disability checks.

“It’s not necessarily people retiring,” Bovino says. “It’s young people going back to school” rather than taking their chances on a weak job market.

Labor force participation for Americans ages 16 to 19 was just 34 per cent last month. That’s near their record low of 33.5 per cent set last year.