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Families have been shrinking and population growth has been slowing in most nations over the past several decades, according to World Bank data.

Expand chart
Data: The World Bank (birth rate, population growth, population); Note: 2.1 live births per woman is replacement level fertility. Chart: Lazaro Gamio/Axios

Why it matters: Labor shortages, strained elderly care systems and slowed economic growth could all follow if birth rates remain below replacement levels for a long period of time, demographers warn.

Populations change slowly, humans are living longer and many rich countries still attract lots of immigrants. So despite almost half of countries around the world having birth rates below the level needed to replace current generations, most of those populations are still growing.

Yes but: We're already starting to see impacts. Hungary, Italy, Portugal, Japan, Ukraine and 17 other nations are already watching their populations decline, according to the 2017 data.

  • Low birth rates have been a factor in the state of Europe's economy, Richard Cincotta, director of the Global Political Demography Program at the Stimson Center, told Axios.
  • Japan is struggling with a critical labor shortage, forcing them to accept more foreign workers.
  • Governments in Japan, Germany, Singapore and other nations have rolled out policies that incentivize having more babies.

What to watch: Immigration could become increasingly important to boosting low fertility nations' populations and sustaining GDP growth. These immigrants could come from places like Niger, Nigeria, Democratic Republic of the Congo and other nations with booming populations. Much would depend on the willingness of governments and communities to welcome more foreigners into their workforces and societies.

On the other hand, with new, emerging technologies, "future economies will probably not need as many workers as they once did," Cincotta said.

  • A future, smaller workforce could lead to higher wages, Global Aging Institute president Richard Jackson said, but taxes would also likely rise to help cover the costs of caring for larger retired generations living longer than ever.
  • And some aging economies with highly skilled workforces, such as in South Korea (which has a very small population of immigrants) and Germany, are doing just fine so far.

The bottom line: Just before the fertility rates plummeted in the '70s, there was spreading concern for overpopulation. Demographic shifts are slow, and the downward trend we're seeing now could still reverse itself, but "each year that goes by with new data showing no rise — or even a decline, as we saw this year — makes a more fundamental shift more likely," Jackson said.

Go deeper:

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State of play: Authorities had initially declined to release the name of the 44-year-old suspect or identify the hostages, all adults, though police chief Michael Miller confirmed that one of those held was Rabbi Charlie Cytron-Walker, who leads the congregation.

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Driving the news: Djokovic will not be able to defend his Australian Open title when the tournament starts in Melbourne. The World No. 1 is looking to break a three-way tie with Roger Federer and Rafael Nadal for most Grand Slam men's singles titles.