How much does global population decline matter? (with Dean Spears)
Dean Spears, an economic demographer at the University of Texas at Austin, discusses global depopulation, low birth rates, and the urgent need for global population strategies. He explores the economic and societal implications of a shrinking population and challenges common misconceptions about its causes and solutions.
Deep Dive Analysis
19 Topic Outline
Introduction to Global Depopulation and Historical Context
Understanding Replacement Birth Rates and Current Global Trends
Impact of Fewer Children vs. Childlessness on Population Decline
Distinguishing Local Overpopulation from Global Population Trends
Projections for Global Population Peak and Subsequent Decline
Reliability of Demographic Projections and Long-Term Trends
Addressing the 'High Birth Rate Subgroup' Argument
The Importance of a Stabilized Global Population
Economic Benefits of Population: Ideas, Progress, and Knowledge
Economic Benefits of Population: Fixed Costs and Demand
Aging Populations and Economic Adjustments
Exploring Theories for Declining Birth Rates
Ineffectiveness of Financial Incentives on Birth Rates
Correlation Between Religiosity and Birth Rates
Birth Rates and Their Role in U.S. Culture Wars
Reconciling Women's Rights with Population Stabilization Goals
Potential Impact of Technologies like Artificial Wombs
Advantages and Disadvantages of a Shrinking Global Population
Call to Action: Broadening the Conversation on Depopulation
5 Key Concepts
Global Depopulation
Global depopulation describes the phenomenon where successive generations are smaller than the ones before them. It is an inevitable outcome when the world's average birth rate falls and remains below approximately two children per two adults, marking a significant departure from historical population growth patterns.
Replacement Birth Rate
This is the average number of children per two adults required to maintain a stable population size, typically cited by demographers as 2.1 to account for individuals who do not survive to adulthood. If the global average birth rate consistently falls below this threshold, it leads to depopulation.
Ideas as Renewable Resources
This concept, central to macroeconomics, posits that knowledge and discoveries are unique economic resources that are used but never used up. They can be infinitely reapplied, leading to continuous progress and improved living standards, making a larger population beneficial for accelerating innovation.
Economics of Fixed Costs
This principle highlights how the initial, unchanging costs of establishing a service, business, or infrastructure (fixed costs) can be more easily met and spread across more individuals when there is a larger population and corresponding demand. This enables the economic feasibility of specialized goods and services that would otherwise be unsustainable.
Opportunity Cost of Children
An economic framework suggesting that the value of what individuals forgo by choosing to have children (e.g., career advancement, personal freedom, financial investments) has increased over time. This rising opportunity cost is presented as a significant, multifaceted driver behind the global decline in birth rates.
10 Questions Answered
Global depopulation is the phenomenon where each successive generation is smaller than the one before it, resulting from global birth rates falling and remaining below an average of two children per two adults.
The current global average birth rate is 2.3 children per two adults, a figure that has been continuously falling for centuries.
While predicting exact future birth rates is difficult, demographers have high confidence in the 'if-then' nature of projections: if the world's birth rate falls below two, depopulation will occur. This confidence is supported by the global convergence of low birth rates, a centuries-long falling trend, and the observation that no country where the birth rate fell below 1.9 has ever returned to 2.
While mathematically possible in theory, empirical evidence suggests this is unlikely in practice because human populations are not just mathematical biology; people make decisions, cultures change, and children often leave their subgroups or adopt lower fertility rates over generations.
Global depopulation matters because human progress, including advancements in living standards, health, and knowledge, is driven by people. Fewer people mean fewer ideas, discoveries, and innovations, potentially hindering future progress and reducing the availability of diverse goods and services.
The exact reasons are complex and not fully understood, with many theories (e.g., capitalism, decline of marriage, individualism, contraception, feminism, wealth, education) failing to account for the global and long-term nature of the decline. The most credible overarching theory is a rising 'opportunity cost of children,' meaning people give up more to have kids than in the past.
Evidence suggests that policies offering money, subsidies, or free social services (like daycare or college) do not significantly increase the total number of children people have over a lifetime, though they might influence the timing of births.
Low birth rates have become a contentious issue, often co-opted by the political right to promote national identity, traditional gender roles, or concerns about racial demographics. This has led to a rejection of the topic by the political left, creating a 'firewall' that prevents broader engagement on the issue from those who also believe in reproductive freedom and progress.
While artificial wombs could significantly improve lives by eliminating the pains and risks of pregnancy, it is skeptical that they would alone raise birth rates back to a stable level. The 'cost' of making a person extends far beyond pregnancy, encompassing many years of child-rearing, which would still remain.
No, depopulation is too slow to address urgent environmental challenges like climate change. The global population is projected to keep growing for decades, and changes in birth rates operate on generational timescales, which are too slow to meet the immediate need for decarbonization.
11 Actionable Insights
1. Prioritize Decarbonization for Climate
Do not rely on global depopulation as a solution for climate change because it is too slow, operating on generational timescales rather than the urgent yearly changes needed. Instead, focus efforts on decarbonization to address environmental challenges effectively.
2. Dads Must Share Parenting
If society desires a future with more children, dads and potential dads must significantly increase their share of parenting work, including tasks like cleaning, nighttime care, cooking, and logistical planning. This helps spread the burdens of child-rearing beyond pregnancy, making it more feasible for parents to choose larger families.
3. Improve Parenting Support
To achieve a stabilized future where people freely choose to have an average of two children, advocate for more support, flexibility, and funding for parenting. This approach ensures a fair and equitable future for both women and men without coercing choices.
4. Engage in Low Birth Rate Conversation
Participate in discussions about low birth rates from a liberal, progressive perspective to prevent illiberal forces from dominating the narrative and shaping societal responses. This ensures that concerns about reproductive freedom and women’s progress are integrated into solutions.
5. Seek Consensus on Stabilization
Recognize that if a stabilized future population (at any level) is desired over indefinite depopulation, then global birth rates must eventually return to an average of two children per two adults and stay there. Work towards building consensus on this goal.
6. Adapt to Aging Populations
Recognize that economic adjustments will be necessary to handle an aging population, as the U.S. average age has increased and is projected to continue rising. Embrace intergenerational transfers as a positive aspect of society, ensuring continued benefits of living in a world with other people.
7. Focus on Average Birth Rate
Don’t let the debate on childlessness distract from the fact that a decline in the average number of children among parents also causes depopulation. This broader perspective helps understand the true drivers of population decline.
8. Distinguish Global from Local
When discussing population issues, differentiate global depopulation from local overpopulation or nationalistic concerns, as the latter can be driven by “awful stuff” and migration can address local imbalances. Focusing on global trends avoids these problematic distractions.
9. Financial Incentives Are Insufficient
Understand that policies offering money or subsidies for children, even significant social spending or tax credits, do not substantially increase overall birth rates. Decisions about having children are deeply personal and not easily swayed by financial incentives alone.
10. Artificial Wombs Aren’t a Silver Bullet
While technologies like artificial wombs could alleviate the physical pains and risks of pregnancy, they are unlikely to significantly increase birth rates alone. The many years of costs and efforts required for child-rearing after birth remain a major factor.
11. Invite Others to Population Discussion
If you are convinced or curious about the importance of global population strategies, actively invite more people into the conversation. This helps retire outdated overpopulation tropes and build consensus for a forward-looking approach to population.
6 Key Quotes
Depopulation is the inevitable consequence of low birth rates.
Dean Spears
1.9, 1.8, that doesn't feel that different from a world that has two in it. So like the United States right now is 1.6, right? And the difference between a world at 1.6 and a world at two or 2.1, you can see it in the statistics, but I don't think you would feel it if you went to the park or went to the grocery store or went to the swimming pool or jogged around the lake.
Dean Spears
Progress comes from people, meaning that we're each better off if we share the world with more other people, more other people living at the same time of us or living before us.
Dean Spears
Ideas are a special type of resource that gets used, but it doesn't get used up. Ideas can be reapplied endlessly. They're a renewable resource. And so more people means more ideas and more progress and better lives.
Dean Spears
For $3,000, would you agree to marry somebody other than the person who you married or plan on marrying? And I've never heard anyone say, yes, I would marry a different person for $3,000.
Dean Spears
Depopulation is coming fast at the level of generations, but not at the level of years.
Dean Spears