Education has long been recognized as one of the strongest drivers of economic growth, productivity, and poverty reduction. Across countries and generations, schooling improves people’s skills, raises wages, expands employment opportunities, and strengthens economies. But learning does not stop once people leave the classroom. A substantial share of human capital is built during working life itself, through experience, training, and on-the-job learning.
Today, education remains one of the most powerful investments societies can make. Yet major inequalities persist in both access to quality schooling and opportunities for skill development at work. While global schooling levels have risen dramatically over the last century, many countries continue to struggle with weak learning outcomes, unequal access, and labor markets that fail to create opportunities for workers to continuously develop their skills.
Education and Human Capital
Economists often use the term “human capital” to describe the knowledge, skills, health, and capabilities that people accumulate over their lives and use to contribute productively to the economy.
Human capital matters enormously for economic development:
- Around two-thirds of the income gap between high-income and low- and middle-income countries can be explained by differences in human capital.
- Roughly one-third of the global reduction in extreme poverty since 1980 can be traced to increases in years of schooling.
Education improves:
- Productivity
- Earnings
- Employment opportunities
- Adaptability to technological change
- Long-term economic mobility
Schools provide foundational skills such as literacy, numeracy, communication, and problem-solving. But formal education is only part of the story. Workers continue learning throughout their careers, and at least 25 percent of the skills people use in their jobs are acquired through workplace learning.
The Expansion of Schooling Worldwide
Over the last several decades, access to education has expanded significantly across most regions of the world.
Expected years of schooling — the number of years a child entering school today is expected to complete by age 18 — have risen steadily:
- South Asia increased from around 8 years to over 11 years.
- Sub-Saharan Africa rose from roughly 7 years to almost 9 years.
- Latin America, East Asia, and the Middle East also experienced substantial gains.
Higher-income regions such as Europe and North America already had near-universal access to primary and secondary education, so changes there were smaller.
Globally, children today receive far more schooling than previous generations.
Long-Term Growth in Educational Attainment
Historical data reveal how dramatically education has expanded over the past century.
In 1920:
- The average adult globally had only 1.6 years of education.
By 1960:
- The global average doubled to 3.5 years.
By 2025:
- Adults aged 25–64 averaged more than 9 years of schooling globally.
However, enormous differences remain between countries:
- Mali averages roughly 3 years of schooling.
- Korea and Ireland exceed 14 years.
Some countries achieved extraordinary progress:
- Korea increased from around 3.5 years of schooling in 1960 to over 14 years by 2025.
- India rose from approximately 1 year to nearly 8 years.
- Mexico expanded from 2.3 years to over 10 years.
- Egypt increased from less than 1 year to more than 8 years.
These improvements were driven largely by rising school enrollment, especially at the primary and secondary levels.
Improvements in Secondary Education
Enrollment in secondary education has expanded rapidly in many developing countries.
In 2000:
- A child in a low-income country had only about a 50 percent chance of completing secondary school.
By 2020:
- That probability rose to around 70 percent.
An important factor behind this progress has been the narrowing of gender gaps in education. More girls are attending and completing school than in previous generations, significantly improving overall educational attainment.
Learning Quality Matters as Much as Schooling Quantity
Years spent in school do not always translate into equal learning outcomes.
Students in higher-income countries generally learn more per year of schooling than students in poorer countries. This has led economists to use the concept of “learning-adjusted years of schooling,” which accounts not only for time spent in school but also for actual learning achieved.
The differences are striking:
- In Mali, children can expect 4.7 years of schooling, but this equals only 2.4 learning-adjusted years.
- In the Philippines, 11 years of schooling translate into only 6.4 learning-adjusted years.
- In Brazil, 12.7 years become 8.3 learning-adjusted years.
- In Korea, the gap between actual and learning-adjusted years is relatively small, reflecting strong education quality.
Globally:
- Learning-adjusted years of schooling are only about two-thirds as high as unadjusted years.
This means many children spend years in school without acquiring adequate foundational skills.
Why Learning Quality Differs
Differences in learning quality often begin long before children enter classrooms.
Children whose mothers completed secondary education are much more likely to:
- Receive adequate nutrition
- Develop cognitive skills early
- Perform better in mathematics and literacy
Family background, neighborhood quality, access to health services, and early childhood development strongly influence educational outcomes.
This creates intergenerational effects:
- Educated mothers tend to raise children with stronger human capital.
- Better home environments complement school quality.
- Educational inequality can persist across generations.
Improving learning outcomes therefore requires investments not only in schools, but also in:
- Nutrition
- Healthcare
- Early childhood development
- Family support systems
Declining Learning Outcomes in Some Countries
One of the most concerning recent trends is the decline in learning quality across many low- and lower-middle-income countries.
Between 2010 and 2025:
- Around one-third of low- and lower-middle-income economies with available data experienced declines in learning-adjusted years of schooling.
In some countries:
- Enrollment continued rising,
- but actual learning outcomes deteriorated.
This means children may be spending more time in school while learning less effectively.
Sub-Saharan Africa has been particularly affected by this trend.
Education and Employment
Education strongly influences labor market outcomes.
Workers with more schooling are:
- More likely to be employed,
- More likely to hold higher-quality jobs,
- More likely to work in wage employment rather than informal self-employment.
The effects are especially strong for women:
- Women with college education are around 16 percentage points more likely to work than women with very little schooling.
Education also shapes the types of jobs workers can access:
- Wage workers typically have about 2.5 more years of schooling than self-employed workers.
- Wage employment generally provides higher earnings growth over time.
The Wage Premium of Education
Education consistently raises earnings across countries.
Examples:
- In Brazil, workers with secondary education earn nearly twice as much as those who did not complete primary school.
- Workers with tertiary education earn roughly 167 percent more.
- Similar patterns exist in India, South Africa, Georgia, and the Philippines.
Globally:
- Each additional year of schooling raises earnings by roughly 10 percent on average.
These returns are remarkably large compared to the cost of schooling.
For example:
- In Sub-Saharan Africa, governments spend approximately $283 per child annually on schooling.
- Yet one additional year of education can generate thousands of dollars in additional lifetime earnings.
Education therefore produces very high economic returns for both individuals and societies.
Learning Continues in the Workplace
Although schooling is essential, workplace learning also plays a major role in building human capital.
Each additional year of work experience increases productivity by approximately 2.5 percent on average.
Since careers often span 40 years or more, workers spend far more time learning on the job than in formal education.
Experience helps workers:
- Improve technical skills
- Learn problem-solving
- Adapt to new technologies
- Build professional networks
- Increase productivity
This process contributes significantly to wage growth over time.
How Education Shapes Career Trajectories
Workers with higher levels of education generally:
- Start with higher wages,
- Experience faster wage growth,
- Continue learning more throughout their careers.
In India:
- Workers without primary education start at low wages and experience modest wage growth over time.
- Workers with tertiary education begin with much higher earnings and see substantially faster wage growth.
Brazil shows an even larger divergence:
- Workers with tertiary degrees eventually earn several times more than workers with minimal education.
Education therefore creates two major advantages:
- Higher entry-level earnings
- Greater long-term learning and productivity growth
As careers progress, these differences compound.
Unequal Opportunities for On-the-Job Learning
Not all jobs provide equal opportunities for skill development.
Workers in:
- Agriculture
- Informal employment
- Microfirms
- Self-employment
- Manual labor
often experience limited workplace learning.
In low- and middle-income countries:
- Around 70 percent of workers are farmers, self-employed workers, or employees in microfirms with limited access to training and skills development.
These jobs often:
- Lack mentorship,
- Use limited technology,
- Provide few opportunities for advancement,
- Offer little formal training.
As a result, less-educated workers can become trapped in low-productivity occupations with minimal opportunities for skill accumulation.
The Relationship Between Technology and Skills
Technology-rich workplaces often accelerate learning.
Workers in modern firms gain experience with:
- Digital tools
- Management systems
- Advanced machinery
- Organizational practices
This helps workers accumulate skills faster and increase productivity over time.
In contrast, workers in low-productivity sectors may experience little skill growth throughout their careers.
This creates widening inequality between workers with access to learning-intensive jobs and those without.
The Broader Importance of Human Capital
Human capital affects far more than individual earnings.
Countries with stronger education systems and more skilled workforces generally experience:
- Faster economic growth
- Higher innovation
- Greater adaptability to technological change
- Lower poverty rates
- Stronger institutions
Investments in human capital also generate broader social benefits:
- Higher tax revenues
- Better health outcomes
- Reduced crime
- Greater civic participation
- Lower dependence on social assistance
The Path Forward
The global expansion of education over the last century represents one of humanity’s greatest achievements. Average schooling levels have risen dramatically, helping improve productivity, earnings, and living standards worldwide.
But major challenges remain.
Many countries still face:
- Weak learning outcomes
- Large educational inequalities
- Poor-quality schools
- Limited workplace learning opportunities
- Persistent gender and income gaps
Improving human capital requires strengthening learning across every stage of life:
- Early childhood development
- Primary and secondary education
- Higher education
- Workplace training
- Lifelong learning systems
The future of economic growth increasingly depends not only on how many years people spend in school, but also on:
- what they learn,
- how effectively they apply those skills,
- and whether labor markets provide opportunities for continued skill development throughout working life.
Education builds the foundation of human capital. Work experience expands and deepens it. Together, they shape productivity, earnings, opportunity, and long-term economic development.
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