Washington: About nine years ago, Hakuo Yanagisawa, the former health minister of Japan, blamed his country’s shrinking population on the finite number of women — or, as he called them, “birth-giving machines.”

“All we can do is ask them to do their best per head,” he asserted in a gaffe heard around the world, reinforcing gender stereotypes that still gripped Japan: Men earned money, and women belonged at home.

Recent data, however, reflect a startling shift: Japanese women now outpace American women in labour force participation. Sixty-four per cent of working-age women in Japan are employed, compared to 63 per cent of American women.

The Japanese employment rate surged in recent years as the US rate declined and then stagnated. The numbers may confuse casual observers, especially those who recall Yanagisawa publicly defining women by their fertility in the not-so-distant past.

And for generations, American women led the developed world in female employment. So, what happened?

Economists don’t know for sure. The culprit could be a combination of changing attitudes toward mothers at work in Japan and relatively limited support for mothers at work in the US.

In 2013, Japanese Prime Minister Shinzo Abe announced he would prioritise gender equality in the workplace, calling it vital to sustained economic growth. Among his goals: Raise the share of mothers who return to work after the birth of their first child to 55 per cent by the year 2020, a move he believes will boost the country’s GDP by 15 per cent.

A 1999 report from Kathy Matsui, Goldman Sach’s first female partner in Japan, fuelled the idea, dubbed ‘Womenonics’.

“Japan is a country with a shrinking population caused by a seemingly intractable decline in its birth rate,” Abe wrote in a 2013 ‘Wall Street Journal’ op-ed. “But Womenomics offers a solution with its core tenet that a country that hires and promotes more women grows economically, and no less important, demographically as well.”

Meanwhile, the recovery in the US has been painfully slow, especially for women.

Roughly 8.7 million jobs vanished during the last recession. Since the downtown ended, however, men have encountered less trouble getting back to work, according to the Economic Policy Institute. Between February 2010 and June 2014, men gained 5.5 million while women gained 3.6 million jobs.

Economist Heidi Hartmann, president of the Institute for Women’s Policy Research, blames this uneven rebound on a blend of forces: the US doesn’t offer family-friendly workplace policies like paid family leave or sick days, and the hasn’t budged much in a decade as the cost of child care has soared.

“The question is: Why didn’t we continue to make upward progress?” Hartmann said. “That’s partly because women don’t feel like they get a fair break in the labour market.”

One thing Japanese women have that many American workers lack: Financial help for new mothers. They receive 58 weeks of maternity leave, 26 of which are paid. Fathers are entitled to the same amount of time off, though less than 2 per cent actually take it.

Abe has also pledged to create 400,000 new day-care spaces nationwide by 2018. Parents additionally receive a “child allowance” from the government, implemented and recently doubled to “reduce the economic burden” on families.

Parents in the US receive no such benefits unless their employers supply it. An estimated 43 million American workers, mostly those at the bottom of the pay scale, report having no access to paid leave.

Economists say that’s one reason the US has been falling behind other countries in the quest for work-life balance. A growing body of research shows that mothers, far more than fathers, are forced to scale back at work or quit, even if they need the income.

In 1990, the women’s labour force participation rate, ages 25 to 54, was 74 per cent, the sixth highest among 22 of the world’s most advanced economies. By 2010, as other countries adopted and expanded family-friendly workplace policies, American women slid to 17th place — “a stunning reversal,” wrote Cornell University researchers Francine Blau and Lawrence Kahn.

“Such policies likely facilitate the labour force entry of less career-oriented women,” the authors concluded. “On the other hand, entitlements to long, paid parental leaves may encourage women who would have otherwise had a stronger labour force commitment to take part-time jobs or lower-level positions.”

The mixed outcome, Blau and Kahn argued: Women in countries with these government mandates could more easily stay in the workforce, but some met discrimination from employers that barred them from promotions. For example, a young woman in a job interview might hear, “Do you expect to have children soon?”

No one policy fix can vanquish unconscious biases that impact hiring decisions, experts say. But talking about the importance of attracting and retaining female workers across all levels, as Japan’s Abe does, could encourage progress, Hartmann said.

There’s incentive for governments worldwide to back that mission. “Getting more women to work outside the home does grow GDP,” she said.

In the 1970s, for example, when more women and a surge of baby boomer men entered workforce, 65 per cent of growth arose from workforce expansion, according to a McKinsey Global Institute report. Today, the study suggests, nearly 80 per cent of growth comes from productivity increases — and American women still disproportionately remain on the economic sidelines.

— Washington Post