A shift in global demographic trends is upon us; it would be wise to adapt.
It isn't quite true that demography is destiny. But if Nicholas Eberstadt is right, our destiny is going to be shaped by demography in ways we may not expect.
Eberstadt studies demographics for the American Enterprise Institute, and makes projections in full awareness that the field has gotten the future wrong before. In the 20th century, the global population increased almost fourfold, to 6.1 billion from 1.6 billion.
"Nothing like this magnitude or tempo of population change had ever previously been witnessed in the history of our species," he has written.
It was reasonable to fear, as many people did during that period, that the result would be mass famines. Instead, the world saw rising prosperity.
Today's most important population trend is falling birthrates. The world's total fertility rate -- the number of children the average woman will bear over her lifetime -- has dropped to 2.6 today from 4.9 in 1960. Half of the people in the world live in countries where the fertility rate is below what demographers reckon is the replacement level of 2.1, and are thus in shrinking societies.
In the United States, we are accustomed to thinking about how this trend affects the welfare state: Longer lives and fewer children make it harder to finance retirement programs. But the rest of the developed world is aging faster, and it's worth thinking about how that will change America's global position as well.
As Eberstadt points out, we can make predictions about the next 20 years with reasonable accuracy. The U.S.'s traditional allies in western Europe and Japan will have less weight in the world. Already the median age in western Europe is higher than that of the state with the most elderly population -- Florida. That median age is rising 1.5 days every week. Japan had only 40 percent as many births in 2007 as it had in 1947.
These countries will have smaller workforces, lower savings rates and higher government debt as a result of their aging. They will probably lose dynamism, as well.
All these effects will, in turn, almost certainly make these countries even less willing than they already are to spend money on their armed forces. Americans who want Europe to bear more of the free world's military burden -- or even provide for its own defense -- are probably going to be disappointed. So will those who expect Europe to take on humanitarian missions. It won't even be able to maintain its current weight in future debates about the values of peace and democracy.
But one country that worries American military strategists will also face serious demographic challenges. China's rise over the last generation has been stunning, but straight-line projections of its future power and influence ignore that its birthrate is 30 percent below the replacement rate.
The Census Bureau predicts that China's population will peak in 2026, just 14 years from now. Its labor force will shrink, and its over-65 population will more than double over the next 20 years, from 115 million to 240 million. It will age very rapidly. Only Japan has aged faster -- and Japan had the great advantage of growing rich before it grew old. By 2030, China will have a slightly higher proportion of the population that is elderly than western Europe does today -- and western Europe, recall, has a higher median age than Florida.
China, notoriously, has another demographic challenge. The normal sex ratio at birth is about 103 to 105 boys for every 100 girls. In China, as a result of the one-child policy and sex-selective abortion, that ratio has been 120 boys for every 100 girls. From 2000 to 2030, the percentage of men in their late 30s who have never been married is projected to quintuple. Eberstadt doesn't believe that having an "army of unmarriageable young men" will improve the country's economy or social cohesion.
He thinks demographic change will pose two problems specific to China. Its society has relied heavily on trust relationships within extended-family networks. In a country where fewer and fewer people will have uncles, those networks will atrophy. The government, meanwhile, relies for its legitimacy on a level of economic performance that the trends imperil.
All in all, Eberstadt concludes, "we might want to have some additional new friends and allies in the world." America's growing ties to India, a nation he describes as "aging moderately," strike him as promising. But he warns that it has not made the most of its population: "India has an appalling education deficit."
Foreign-policy thinkers can often lose sight of demographic trends, Eberstadt says, because from a policymaker's view "they tend to look really glacial. If it's not happening in the next 48 to 72 hours, it's not in the inbox." But "population change gradually and very unforgivingly alters the realm of the possible."
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