The global fertility crisis
The IMF article by David E. Bloom, Michael Kuhn, and Klaus Prettner presents a comprehensive analysis of declining global fertility rates and their far-reaching consequences for economic development, social structures, and environmental sustainability. The findings reveal both significant challenges and potential opportunities arising from this demographic transition.
Demographic transformation
Global fertility rates have experienced a dramatic decline from 5 children per woman in 1950 to 2.24 in 2025, with projections indicating the rate will fall below the replacement level of 2.1 around 2050. The current demographic transition differs significantly from historical population declines, which typically resulted from catastrophic events like wars, famines, or epidemics rather than voluntary fertility choices. The demographic shift is not uniform globally. While fertility rates declined in every UN region and World Bank income group during 2000-25, Africa remains an exception with fertility rates of 4 or higher in many countries. Consequently, Africa’s share of global population is projected to increase from 19 percent in 2025 to 26 percent by 2050.
Population decline projections
Over the next 25 years, 38 nations with populations exceeding 1 million will likely experience population declines, nearly double the 21 countries that faced similar declines in the past quarter-century. The most significant absolute population losses are projected for:
– China: 155.8 million people
– Japan: 18 million people
– Russia: 7.9 million people
– Italy: 7.3 million people
– Ukraine: 7 million people
– South Korea: 6.5 million people
Economic challenges
- Innovation and growth concerns: Fewer births translate to fewer future workers, researchers, inventors, and scientists, potentially creating a shortage of innovative ideas. Stanford economist Charles Jones argues this could strangle innovation and result in economic stagnation.
- Aging population burden: Countries experiencing population decline will see their 65-and-older demographic nearly double from 17.3 percent to 30.9 percent between 2025 and 2050. This aging population creates significant burdens through increased healthcare costs, long-term care needs, and pension obligations while reducing the proportion of economically productive individuals.
- Geopolitical implications: Slow or negative population growth relative to other countries may translate into reduced military might and political influence on the world stage.
Economic opportunities
- Resource reallocation: Reduced spending on housing and childcare could free resources for research and development, advanced technology adoption, and improved education quality.
- Demographic dividend: Fertility declines can stimulate economic growth by increasing labor force participation, particularly among women, while boosting savings and capital accumulation. This phenomenon contributed 2-3 percentage points to per capita income growth in many countries following the post-World War II baby boom.
- Human capital quality: Brown University economist Oded Galor argues that falling fertility combined with rising education levels will lead to enhanced human capital formation and long-term prosperity increases. The focus shifts from population quantity to quality, emphasizing the importance of healthy, well-educated individuals.
- Environmental benefits: Population decline may reduce environmental pressures including climate change, natural resource depletion, pollution, deforestation, and biodiversity loss.
The Debate over Falling Fertility
By: David E. Bloom, Michael Kuhn, Klaus Prettner – Harvard University, International Institute for Applied Systems Analysis, Vienna University of Economics and Business
Why did fertility decline?
In this paper Claudia Goldin employs several methodological approaches to examine why fertility has declined. She develops a simple two-period model of birth rate demand focusing on women’s education and career decisions versus childbearing, incorporates the role of father “dependability” (high-type or modern men vs. low-type or traditional men) and commitment problems. Goldin examines fertility patterns across two groups of developed nations:
- Group 1: Denmark, France, Germany, Sweden, U.K., and U.S. (moderate fertility decline)
- Group 2: Greece, Italy, Japan, Korea, Portugal, and Spain (“lowest low” fertility)
She uses historical data from 1920-2022 for total fertility rates (TFR) from the World Bank Development Indicators, the U.S. Census data and Current Population Survey (CPS), the OECD Time Use Database for household labor division, as well as historical demographic data from multiple countries. Goldin’s main findings include:
- The central cause: increased female autonomy
The primary driver of fertility decline is women’s enhanced agency through greater access to education, improved employment opportunities, and reproductive rights and contraceptive access. This autonomy enables women to delay marriage, pursue careers, and have greater control over childbearing decisions.
- The “Mismatch” problem
Fertility decline results from a mismatch between what women need (partner commitment to share childcare) and what men credibly provide. Women with higher education face a “child penalty” if fathers don’t share domestic responsibilities. When probability is low that men will abandon traditional gender roles, career-oriented women either delay childbearing or remain childless.
- Impact of economic growth speed
Countries with rapid economic growth (Group 2) experienced more severe fertility decline than those with steady growth (Group 1). Rapid growth creates “gendered and generational conflicts” where:
– Women benefit more from abandoning traditional roles
– Men benefit more from maintaining traditional arrangements
This dynamic is evident in household labor division: Group 2 countries show much larger gender gaps in unpaid household work.
- Recent trends and “intensive parenting”
Post-2007 fertility decline is linked to:
– Increased expectations of “intensive parenting”
– Higher perceived costs of child-rearing
– Continued delays in childbearing among educated women
– Some evidence of “rat-race” dynamics in education, particularly in countries like Korea
- Policy implications
Traditional pro-natalist policies (subsidized childcare, parental leave) may help but don’t address the fundamental mismatch problem. There is need for policies that encourage men’s participation in childcare and domestic responsibilities.
The Downside of Fertility
Author: Claudia Goldin
From: Harvard University
