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China recently joined the long list of countries that had more deaths than births in 2023, underscoring a declining population trend that could upend the global economy. Demographic changes have major implications.

The United Nations predicts the world will reach peak population around 2086, but I think that figure may be optimistic. One reason is because the pandemic-era baby bust in some countries may have worsened the decline, and the problem appears to be long-lasting. Even in certain African and Latin American countries, where birthrates are historically high, the number of newborns has dropped closer to the replacement rate of 2.1 children per woman. Given these trends, humanity’s population could peak around 2050.

Crossing a demographics point of no return

But what does a planet with fewer people mean for society? It’s a position the modern world hasn’t been in, so we would be crossing a demographics Rubicon.

Demographics influence what people buy and a company’s revenue potential. From an economist’s perspective, it helps determine monetary policy and, ultimately, the well-being of each successive generation.

I prefer to look at countries individually because there are many idiosyncrasies, whether cultural or policy related. In the United States, demographic trends are favourable for growth compared to developed economies even though birthrates have dropped rapidly since the 1960s to the current level of 1.7%. That figure may be low, but it is higher than Europe, Japan and other developed economies. I think the U.S. population decline will be less severe, in part because immigration policies are more liberal. Data shows that immigrants tend to have more children.

Japan is likely the most studied example of a shrinking society. The country has seen its population fall off for several decades, and its experience shows how quickly that can snowball. Japan reported 20,000 fewer people in 2008, and that figure has since ballooned to 831,872 fewer people in 2023. Prime Minister Fumio Kishida called the trend “the gravest crisis our country faces.”

China’s population decline has just begun, but I suspect it will face challenges not unlike Japan. How the Chinese government responds, in terms of economic stimulus and productivity expectations, will be important. In some ways, China may be more vulnerable since its economic development is much lower than when Japan’s population started to shrink. China ended its one-child policy in 2016 and has since introduced financial incentives for couples to have multiple children, but so far it hasn’t helped.

I won’t say it’s impossible to reverse population trends, but many Nordic countries have tried and failed to stem the lowering tide of demographics. They’ve offered everything from financial incentives to child care programs, but these plans have barely moved the needle, if at all.

As a result of China’s population decline, countries that rely on it for trade, such as Australia and Southeast Asian countries, could experience slower economic growth. But there are opportunities as well, since several of these emerging markets have better demographics and could offer incentives to bring supply chains home.

Declining population is negative for growth

Economists care about demographics for a reason. Put simply, the long-run economic growth rate of a country depends heavily on population growth, with the other piece of the puzzle being productivity, which measures worker efficiency. That is, if you have population growing at 2% and productivity at about 1%, a country’s gross domestic product is about 3%.

Sustained growth flows through to eventually increase income per person — an important indicator of the overall health of an economy. Over past generations, income has been growing for much of the world, alongside quality of life.

The obvious takeaway from population decline is fewer workers as more people retire. This can lead to an imbalance as government revenues from taxes fall and spending on retirees increases. When this happens, young people tend to leave that country or society, further exacerbating the problem.

There are also far-reaching consequences for industries ranging from consumer goods to health care and housing. In the case of the latter, supply scarcity could worsen as labour shortages and older people choosing to age in place rather than sell have kept home prices high. It will be essential for companies to continue to adapt. For example, as U.S. mortgage rates surged from around 3% to 8% when the U.S. Federal Reserve began raising rates in March 2022, homebuilding company Lennar offered large rate buydowns to customers, which helped boost affordability.

Investors have rightfully focused on health care as an area ripe for innovation to deal with declining birth rates, longer life expectancy and rising labour costs. For example, U.S. pharmacy company CVS Health has responded to these demographic trends via services such as walk-in clinics and programs that offer lower drug prices. The company has also sought to reduce costs by integrating its supply chain, including acquisitions of insurance companies and drug price negotiators.

Price distortions

It might seem ridiculous to write about deflation given the yearslong battle central banks worldwide are waging against rapid price increases. However, Japan presents a compelling case study of why deflation, or falling prices, may be the result of demographic shifts.

The scenario is straightforward: Every day in Japan there are fewer people and less demand for goods and services, which exerts a downward pressure on prices. When this happens, economic slumps or recessions are more likely, and typical central bank toolkits to combat downturns — such as lowering rates — aren’t as effective. The Bank of Japan implemented a negative interest rate policy in 2016 to spur economic growth, but that policy is largely viewed as a failure as GDP has generally been weak since the early 1990s.

Deflation is a problem no central bank wants to wrestle with. Falling prices are associated with stagnant growth, weak spending and low overall confidence in the future. It’s basically kryptonite for the economy.

Japan is just one example. There are some influential economists who think declining demographics could lead to structurally higher inflation as a dwindling labour force pushes wages and production costs higher.

Robots to the rescue?

There’s an unintentional collision of two forces happening right now: demographics and artificial intelligence (AI). These two disruptive megatrends will change the future of work across health care, manufacturing, commerce and more.

Some might look at current demographic trends and think the world will be negatively impacted. Others note fewer people could mean less stress on the environment. There is a strong relationship between population growth and carbon dioxide emissions: When economic activity increases, so do CO2 emissions.

AI could herald a new era of increases in productivity, so perhaps we don’t need as many people as we did in the past for growth.

It’s still very early, but I hope AI can fill the gaps left by demographic trends so that some of the worst-case scenarios projected won’t happen. Instead, we’ll be looking at a society that’s not just resilient, but very adaptable to potential shocks.