When China launched its one-child policy more than four decades ago, it sped up an evolution toward smaller family sizes that would have happened more gradually.

The policy supercharged the country’s workforce: By caring for fewer children, young people could be more productive and put aside more money. For years, just as China was opening its economy, the share of working-age Chinese grew faster than the parts of the population that didn’t work. That was a big factor in China’s economic miracle.

There was a price and China is now paying it. Limiting births then means fewer workers now, and fewer women to give birth. A United Nations forecast published Thursday shows how quickly China is aging, a demographic crunch that the U.N. predicts will cut China’s population by more than half by the end of the century.

In the late 1970s, China’s leaders feared a population explosion that would drain the country’s resources. When Deng Xiaoping rolled out the one-child policy nationwide in 1980, he said, “We must do this. Otherwise, our economy cannot be developed well.”

A young population has helped drive economic growth in developing countries across the world, including in China’s neighbor Japan starting in the 1950s. Economists call it a demographic dividend—the window, generally of a few decades, when a country has far more working-age people than young and elderly dependents. As such countries grow wealthier, people naturally choose to have fewer children and the population starts to age.

That was also the trajectory in China—just faster.

Knowingly or not, China essentially borrowed from its own future by accelerating its so-called demographic window. How the effects of the policy have sped up China’s demographic bind is scrambling the long-term models demographers usually work with.

“The challenge with China is that from one year to another the situation can change quite fast,” said Patrick Gerland , head of the U.N.’s population estimates and projection section. “Within the last decade, the changes have been very big, both in policy and in the numbers.”

For example, in its just-published global estimates, the U.N. expects China’s population to drop from 1.4 billion today to 639 million by 2100, a much steeper drop than the 766.7 million it predicted just two years ago.

Even so, the U.N.’s prediction looks optimistic compared with other estimates. Researchers from Victoria University in Australia and the Shanghai Academy of Social Sciences have predicted that China will have just 525 million people by the end of the century.

It is impossible to say what China’s population trajectory would have been without the one-child policy. But a comparison with a broad group of other countries gives a clue.

Research by U.N. demographers illustrates how China’s demographic window opened faster and more sharply than in other “less developed” countries, and then closed equally quickly. The population of Chinese aged 20-64—the age when people are most likely to work—grew faster than children and the elderly in the years after the one-child policy was implemented. Before the policy ended, the trajectories had already reversed.

The broader group of other countries shows a smoother ride with the demographic window lasting well into the 2040s.

With China’s opening to the West, it became the world’s factory floor with millions of young people determined to work their way out of poverty. For most of the next decades, Chinese growth topped double-digit percentages.

The optimism was on full display during the 2008 Beijing Summer Olympic Games. When the global financial crisis hit soon after, China kept growth humming and was credited with helping to save the global economy. A few years later, China overtook Japan as the world’s No. 2 economy.

But by 2013, China’s demographic dividend was largely over, according to research by Andrew Mason , an emeritus professor of economics at the University of Hawaii, and Wang Feng , a sociology professor at the University of California, Irvine.

Now, slowing economic growth and demographic changes feed off each other for a gloomy outlook.

“People always count on the [Chinese] government to do more to prop up the economy but the reality is that there’s not a lot the government can do,” Wang said.

Over the next decades, China’s population is likely to show a contrast from, say, India, where the age distribution is following a more natural progression, or the U.S., where immigrant inflows help counteract the aging of the population.

By the end of the century, the U.S. population will be about two-thirds of China’s, compared with less than a quarter now, according to the U.N.’s latest projections. And by then, India, which has overtaken China as the world’s most populous country, will have more than twice as many people as China.

The real demographic impact in China won’t fully hit until the middle of the century, when many of those born during the one-child policy will reach retirement—while still caring for aging parents, said Wang.

By 2050, the U.N. now projects 31% of Chinese will be 65 or older. By 2100, the share will be 46%, approaching half of the population. In the U.S., the share is expected to be 23% and 28%, respectively.

The U.N.’s revised forecasts see Chinese births dropping below nine million this year. In 2022, it had predicted that 10.6 million would be born in China in 2024. The U.N. now expects China will have only 3.1 million newborns a year by 2100.

Not only are there fewer women to give birth these days, but many young women, mindful of their mothers’ suffering during the one-child policy, are less interested in marriage and children, driving down the fertility rate.

As births slip, China’s elderly population is ballooning.

China expects a glut of more than 40 million new retirees—more than the population of Canada—over the five-year period ending in 2025.

The old-age support ratio, a rough indicator of the number of workers for each retiree used by the Organization for Economic Cooperation and Development, is projected to decline from more than four now to fewer than two in 2050, according to The Wall Street Journal’s calculations of the U.N.’s latest data. It will likely reach one worker per retiree by the end of the century.

In reality, due to China’s low retirement age, with women clocking out as early as 50 and men at 60, the support ratio could be even lower.

Beijing as well as demographers and sociologists have said a highly educated population and the advancement of technology such as artificial intelligence, could help China weather such shocks, as more jobs will be automated.

The U.N.’s Gerland said that while the one-child policy was the main demographic event in recent decades, the waxing and waning in different Chinese age groups also reflect tumultuous periods in China’s past, such as the Cultural Revolution and Great Leap Forward, which had substantial demographic impact on the size of the various cohorts born during these years.

“Because of China’s history, the population is going to carry over some of these memories of the past and it will take many generations for all of these past stories to be forgotten,” he said.

Ruben Roy isn’t a guy who tends to beat himself up, but he’s still chagrined about what he said on an earnings call last month.

A managing director at Stifel Financial , Roy dialled in to hear the chief executive of a healthcare company discuss its latest results. During the Q&A, Roy asked the speaker to elaborate on his remarks about investment opportunities.

“I wanted to double-click a bit on some of the commentary you had,” Roy said, instantly cringing.

One of the fastest-spreading corporate buzzwords in recent years, “double-click” is both polarising and pervasive. Particularly on Wall Street, the figure of speech is now being used as a shorthand for examining something more fully, akin to double-clicking to see a computer folder’s contents. Some, like Roy, find the idiom obnoxious or twee. Double-click defenders say the phrase encourages deeper thinking.

Either way, it’s become a verbal tic du jour. Executives and analysts dropped double-click 644 times in corporate conference calls and events during the first half of the year, according to VIQ Solutions, up from 139 times in the same period of 2020.

“It’s almost like a joke. People are like, oh here we go with double-click,” says Roy, who’d been trying to avoid using the term when he accidentally let it slip. Colleagues, he says, haven’t let him forget it.

Annie Mosbacher, a Los Angeles-based marketer, recalls snapping to attention last year when she heard an executive use the phrase during a strategy meeting. Afterward, she and colleagues discussed it: “It was like, oh my gosh, double-click? I guess this is a thing now?”

The new jargon makes her roll her eyes. “Can’t we just say ‘this is an area we need to focus on?’” she says. “We regurgitate this sort of lingo as though it means something, and usually it’s about trying to be impressive more than anything else.”

Not so, says Ruben Linder, who’s owned a small audio and video production business in San Antonio for 25 years. These days, with the rise of technology and a more hectic corporate life, Linder says people need reminders to stop and examine what matters—to double-click, if you will.

“The term is simple, but it’s really profound,” he says. He tries to carve out time to go to a cafe twice monthly with a notebook and engage in reflection.

“I’ll double-click on my business, double-click on my life,” he says. “I double-click on everything now.”

Double-click lingo has leapfrogged beyond corporate America. While CEOs including Walmart’s Douglas McMillon and Nvidia ’s Jensen Huang have deployed the term, so, too, have congressional representatives, influencers and authors such as parenting guru Dr. Becky Kennedy.

The phrase is “innovative,” says Beth DelGiacco, a vice president of corporate communications at biotech company Argenx , who praises its efficiency.

“It’s only a few syllables. Everyone knows what you mean when you say it,” says DelGiacco, who regularly trots it out with peers.

Tech-inflected buzzwords are especially apt to gain traction—think “network,” “bandwidth” or “take offline”—because they can sound smart or cutting-edge, says Doug Guilbeault, an assistant professor at UC Berkeley’s Haas School of Business who has studied corporate jargon.

The inventor of the literal double-click, former Apple designer Bill Atkinson, isn’t convinced. Reached while boating on a recent weekday, Atkinson, now retired, says he’s never heard anyone use double-click as a metaphor and would steer clear of such usage himself, preferring more straightforward language.

He adds that since inventing the function in 1979, he’s come to regret it. He now thinks an extra “Shift” button on the mouse would have been more user-friendly.

“The double-click was a mistake,” says Atkinson, who left tech in 1995 to pursue nature photography. Personally, he double-clicks less frequently these days, given the rise of mouseless devices like tablets and smartphones.

“I double-tap, or I tap,” he says. “I long-press.”

Buzzwords tend to come and go, says HR consultant Nancy Settle-Murphy, noting that other tech-inspired jargon, such as “RTFM”—or read the f—ing manual—are less commonly used today than they once were.

“There are fewer manuals now,” says Settle-Murphy, who recently installed a video doorbell at her home and notes it didn’t come with any pictures or diagrams.

Corporate jargon can be alienating. At a conference, Settle-Murphy was thrown when an audience member asked the speaker to double-click on a point they’d made.

“I thought, ‘these are slides, there’s no link, how can they double-click?’” she says, admitting she later searched online to find the new meaning.

Double-click has a long pedigree in the sales world. Matt Sunshine, head of the Center for Sales Strategy, which trains salespeople, says when he sold ad spots for a local radio station in Dallas in the 1990s, peers commonly used the term.

“Sales leaders would say, ‘Hey, you need to make sure you double-click on that’ with your prospects,” Sunshine says, meaning delve more deeply into any issues customers might raise, as in “Tell me more.”

While he doesn’t know exactly when it first took off, he says the phrase neatly encapsulates a core principle in effective sales strategy, in which salespeople seek to identify and address customers’ needs and concerns, instead of defaulting to one-size-fits-all pitches.

Double-clicking can help identify new business prospects, says Scott Bond, vice president of consumer services at Canadian real-estate company Rennie, which recently opened a U.S. location in Seattle.

Not long ago, Bond was on a Zoom call with his boss and some new business contacts based in southern California. The group hit it off, and afterward, Bond found himself mulling possibilities.

“I looked at my boss and said, hold on, I think we’re being presented with an opportunity here,” he says. “Why don’t we dive in and learn a little more?” His boss agreed, and the company is now planning to open its second American location in the Palm Springs area.

“We double-clicked,” he says.

When it comes to France’s turbulent politics , the current impasse is probably the best investors could have hoped for.

The second round of French legislative elections delivered a widely expected hung parliament, but not its predicted makeup: Rather than coming in first, Marine Le Pen ’s far-right and anti-immigrant National Rally finished third. In a shock twist , the leftist New Popular Front alliance emerged victorious, with the party of President Emmanuel Macron and its allies in second place.

This is because leftists and centrists ended up coordinating. In many local races, candidates dropped out to avoid dividing the vote against the far right. Still, no party has an outright majority, which plunges the country into political gridlock. This was, counterintuitively, the preferred outcome for financial markets.

The CAC 40 initially tumbled when the elections were called in June, driven by fears of a potential National Rally government challenging the European Union with fiscally expansive plans. Then the French stock benchmark perked up, as the first-round results suggested that the far-right wouldn’t get a majority.

Yet markets remained volatile because the rise of the New Popular Front raised even greater concerns. The policies of this coalition, in which leftist firebrand Jean-Luc Mélenchon is a key leader, also include more public spending, on top of widespread tax increases. Indeed, the CAC 40 closed down 0.6% Monday, probably reflecting investors’ concerns about these parties potentially managing to form a new government. Mélenchon has stated that there will be no deals with the centrists.

These worries seem overblown. Yes, there are doubts about how France will handle its budget deficit, which amounted to 5.5% of gross domestic product in 2023 and has forced the EU to launch an “excessive deficit procedure” against the country. Macron may need to accept the reversal of reforms such as a higher retirement age.

Still, a fiscal crisis isn’t in the cards, because the European Central Bank is ultimately in control of France’s bond market.

As for economic growth, it is unclear how much impact Macron’s policies have had in the first place, particularly given resistance from unions and swaths of the public, which resulted in the famous “yellow vest” protests in 2018 and 2020.

What matters for sectors battered in the stock market, including banks, energy firms and infrastructure operators, is that the risk of widespread tax increases, nationalisations and a prolonged standoff with Brussels seems smaller now than a few weeks ago. Whatever Mélenchon says, the left will either have to compromise or else form a minority government that might scare investors but wouldn’t be able to pass laws.

So there isn’t much justification for the lower valuation of lenders such as Société Générale and especially BNP Paribas —one of Europe’s most interesting banks that now trades at 0.65 times tangible book value. The same is likely true for firms such as energy utility Engie and infrastructure-concessions leader Vinci , which have lost 8% of their market value since the end of May.

These elections are more a symptom of Macron’s weakness than its cause. After a chaotic month, French politics is back where it has been for years, with a rising far right forcing the left to back a centrist platform that can achieve little because few people actually like it. Macron himself became president on an anti-Le Pen ticket, but in seven years has failed to rally broad support for his pro-business vision.

This could eventually make Le Pen’s victory inevitable, as she claimed after initial results came in. For now, though, it is more or less what markets ordered.