Macroeconomics
Economic Growth
Long-run increase in production — drivers and theories
Economic growth is the long-run increase in real GDP per capita — sustained rise in living standards. Drivers: (1) Capital accumulation (more equipment, infrastructure). (2) Labor force growth. (3) Human capital (education, skills). (4) Technological progress (most important long-run). (5) Institutions (property rights, rule of law). Solow growth model (1956): capital accumulation has diminishing returns; long-run growth from technology. Endogenous growth: technology arises from R&D, education. Major question: why some countries grow fast, others slowly? Differences: institutions, geography, culture, policy.
- DefinitionLong-run increase in real GDP per capita
- DriversCapital, labor, human capital, technology, institutions
- Solow model (1956)Capital diminishing returns; tech drives long-run growth
- Endogenous growthTechnology arises from R&D, education
- ConvergencePoor countries can catch up; mixed evidence
- Big picture~80% of human history: stagnation; recent: rapid growth
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Why growth matters
- Living standards. Foundation of human progress.
- Poverty reduction. Key mechanism.
- Public policy. Long-run focus.
- International economics. Country comparisons.
- Climate. Sustainable growth question.
- Education. Foundational macro.
- Inequality. Growth + distribution matters.
Common misconceptions
- Growth automatic. Required institutions, investment, etc.
- All growth same. Different sources, sustainability.
- Capital accumulation alone enough. Diminishing returns.
- Technology exogenous. Endogenous growth: arises from investment.
- Always desirable. Trade-offs (inequality, environment).
- Recent miracle continues. Productivity slowdown observed.
Frequently asked questions
What's economic growth?
Sustained increase in production over time. Usually measured: real GDP per capita growth. Long-run focus: structural changes vs short-run fluctuations. Sources: more inputs (capital, labor) and better productivity (technology, organization). Modern economic growth: rapid since Industrial Revolution. Most of human history: minimal growth.
What's the Solow model?
Robert Solow (1956). Most influential growth model. Output: function of capital and labor. Output growth: from capital accumulation, labor force growth, and "Solow residual" (technology). Capital accumulation: diminishing returns; can't grow indefinitely. Long-run growth: only from technological progress. Solow Nobel Prize 1987.
What's endogenous growth?
Newer model. Romer (1990, Nobel 2018). Technology not just exogenous — arises from intentional R&D, learning by doing. Investment in research, education increases productivity. Increasing returns possible. Implication: policy can affect growth (R&D subsidies, education investment). Different from Solow's exogenous technology assumption.
What's convergence?
Theoretical: poor countries grow faster than rich ones (catch up). Reasons: easier to copy existing technology than create new; more capital opportunities. Empirical: mixed. Some "club convergence": similar institutions catch up. Many countries: stuck or diverging. Evidence: not unconditional convergence. Conditional convergence: countries with similar fundamentals converge.
What about institutions?
Acemoglu, Robinson "Why Nations Fail" (2012). Differences in growth: largely institutional. Inclusive institutions (property rights, rule of law, broad participation): support growth. Extractive institutions (concentrated power, weak rule of law): hold back. Examples: North vs South Korea; settler colonies. Major contemporary view.
What's the productivity puzzle?
Recent: productivity growth slower in advanced economies despite tech progress (smartphones, internet, AI). Pre-2000s growth ~2.5%/year; recent ~1%. Reasons debated. (1) Mismeasurement (services hard to measure). (2) Diminishing returns to current tech wave. (3) Demographic headwinds (aging). (4) Weak investment. (5) Inequality reducing demand. Active research.
What drives long-run growth?
Multiple factors. (1) Investment in capital and education. (2) Technology (R&D). (3) Institutional quality (rule of law, property rights). (4) Open trade and integration. (5) Human capital — health, education. (6) Demography — younger population, women entering workforce. (7) Stable macro environment (low inflation, manageable debt). Combined: persistent growth.