Across the world, people are having fewer children. Fertility and Birth rates are declining rapidly in countries as diverse as the United States, Finland, Mexico, and Turkey.
Once seen as a niche concern, fertility decline has now grabbed global attention — even Elon Musk has called it “civilization’s greatest threat.”
Why birth rates are falling is hotly debated. Some experts blame rising education and career opportunities for women; others point to the soaring cost of childcare, housing, and overall economic pressures.
But King’s College London social scientist Dr Alice Evans offers a different theory: the rise of singlehood.
“What has happened everywhere, all at once, is a rise in the number of singles,” Evans told Today, Explained co-host Noel King. “And it precisely correlates with the decline in fertility.”
Why Are People Having Fewer Kids?
There are several theories about what’s driving this trend:
- The Conservative Argument
Some on the political right blame so-called “overeducated, selfish” women — often mocking them as “childless cat ladies.” But Evans points out that this doesn’t explain the global pattern. In countries like Tunisia and Turkey, where female labor force participation is low (around 30%), fertility rates have still plummeted to 1.5 children per woman. In India’s highly patriarchal society, the southern state of Tamil Nadu has the same fertility rate (1.4) as England and Wales.
It’s clear that this isn’t just about women choosing careers over children — and it isn’t confined to Western nations.
- The Economic Explanation
Another popular theory is that raising children has simply become too expensive. Women would like to have more children, but they can’t afford to. There’s not enough support.
High housing costs, costly childcare, and stagnant wages are real obstacles. Now these difficulties are real, and governments should address these economic challenges.
However, she argues this cannot fully explain why fertility is falling everywhere — in both rich and poor countries, across very different economic contexts.
Evans’ Theory: The Rise of Singlehood
So, why are so many people staying single?
Historically, people married for three main reasons: love, money, or respect.
In conservative societies, where singledom is totally stigmatized, then marriage was often necessary to gain respectability. Families, neighbours, and even distant relatives pressured young people to settle down.
But times have changed. As societies liberalize and gender equality increases, there’s less social pressure to marry. Women earning their own income no longer need to marry for financial security. Cultural shifts — think Miley Cyrus singing “I can buy myself flowers” — celebrate independence and single living.
Another major shift happening worldwide — across all income levels — is the rise of hyper-engaging digital entertainment. Whether it’s scrolling through TikTok, binge-watching Bridgerton on Netflix, streaming a Blackpink concert, or spending hours on video games, people now have instant access to the most entertaining and captivating content. This digital world offers endless stimulation at the tap of a screen, making it easier than ever to stay home, stay distracted, and stay disconnected from real-life relationships.
“Why venture out when everything is at your fingertips?” asks Evans.
Data backs this up. In recent surveys:
- 65% of young American men said, “No one knows me well.”
- 28% of Gen Z reported they didn’t socialize with anyone outside their household in the past week.
This trend isn’t limited to the West. Evans recalls mothers in small Mexican towns and rural villages in India and Bangladesh sharing the same concern: their teenage sons are spending all their time alone in their rooms, glued to screens.
A Global Shift
Evans’ research points to an undeniable global pattern — increasing isolation, rising singlehood, and fewer romantic partnerships — all contributing to the ongoing decline in fertility.
While economic factors and women’s empowerment have long been part of the conversation, Evans believes that the quiet revolution in how people connect (or fail to) might be the most overlooked driver of falling birth rates.
