Human Capital in Endogenous Growth Theory

Human-capital formation is the improvement of people’s knowledge, skills and health through education, training and healthcare. In endogenous growth theory, such investment helps generate technological progress within the economy, rather than treating technology as an external source of growth.

Channels linking human capital with innovation

• A larger pool of scientists, engineers and skilled workers raises the productivity of research and development, increasing the likelihood of commercially useful innovations.
• Educated workers improve an economy’s absorptive capacity, enabling firms to understand, adapt and diffuse technologies developed elsewhere.
• Learning, training and experience generate knowledge spillovers: one worker’s expertise can raise the productivity of colleagues and other firms.
• Better health improves workers’ learning capacity, effective working life and participation in skill-intensive production.

How innovation sustains endogenous growth

Knowledge is largely non-rival, because its use by one firm does not necessarily prevent its use by another. New ideas therefore improve products and production methods across the economy, allowing productivity growth to continue despite diminishing returns to ordinary physical capital.

• In Lucas-type models, individual skill accumulation also creates wider productivity benefits through human-capital externalities.
• In Romer-type models, profit-seeking firms deliberately invest resources in creating new ideas, designs and technologies.
• Human capital complements physical and digital capital, making investment in advanced equipment and research infrastructure more productive.

Private R&D incentives and policy role

Skilled researchers raise the expected return on private R&D, encouraging firms to mobilize finance for innovation. However, firms may invest less than the socially desirable amount because knowledge spills over to others and research outcomes are uncertain.

• Public investment in quality education, health and research infrastructure strengthens the supply of innovation-ready human capital.
• Research grants, competitive markets and university-industry linkages can help convert knowledge into productive innovation.
• Human capital supports growth only when skills are effectively employed and institutions permit experimentation, entrepreneurship and diffusion.

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