Chapter 18 Lecuture Notes part 1 (Econ)
Why economists care about economic growth
Growth matters because it relates to material and nonmaterial wealth, i.e., standard of living, which can include happiness and social well-being.
Happiness is a nonmaterial measure that can rise with factors like climate, social norms, and community activities (e.g., group games).
Standard of living is also shaped by socioeconomic status, access to health care, and work environment.
Example: Norway as a wealthy country due to oil wealth and a large sovereign wealth fund; government provides high public support for education (free), health care (free), and social safeguards, alongside high-quality environments and work surroundings.
Public spending debates exist in wealthy systems about whether to cut back or continue investing in public services.
Key takeaway: standard of living depends not only on income (money) but also on health, education, public services, and environment.
Measuring standard of living and the cross-country relationship
Standard measures often include infant mortality; in cross-country comparisons, countries with higher real GDP per capita tend to show better outcomes on these measures on average.
Cross-sectional relationship: as real GDP per capita increases, indicators like infant mortality tend to improve, and happiness tends to rise on average (with exceptions).
Example comparisons:
US vs Norway: infant mortality differences are relatively small, but in some cases, cross-country comparisons show meaningful gaps.
US vs South Africa: infant mortality differences are large and widely studied.
The lecturer notes a distinct cross-sectional pattern: higher real GDP per capita generally aligns with better living standards, though there are notable outliers and nuances.
The happiest country discussion: Finland is frequently cited as very happy, with seasonal effects (long winter, long summer daylight) contributing to well-being, outdoor activity, and productivity.
The notion of happiness here is tied to social conditions and environmental quality, not just income.
Real GDP growth vs real GDP per capita growth
Real GDP growth: the overall increase in a country’s real output; measures how much the economy expands in total.
Real GDP per capita growth: the growth rate of real GDP divided by the number of people, i.e., population-adjusted growth, often written as:
where $Y$ is real GDP and $N$ is population.
Population measurement caveat: population data come from censuses; in between censuses, estimates are used, which can introduce noise.
Practical approach: many economists use percent change in real GDP per capita, unless analyzing very long time horizons where population change matters more.
For long spans (e.g., up to and centuries equivalents), accounting for population changes becomes important.
Economic growth vs economic development
Economic growth refers to increases in real output (and often real GDP per capita) over time.
Economic development is broader: long-term improvements in health care, education, infrastructure, poverty reduction, and overall quality of life.
Growth can occur without development if gains are confined to specific sectors or groups and do not translate into broad-based improvements.
Development looks at underlying factors that enable broad-based improvements across society.
For developing regions (Africa, Asia, Southeast Asia), development is especially central as growth alone may not guarantee improvements in living standards for the entire population.
Historical perspective on economic growth
Growth as a widespread phenomenon is relatively new; macroeconomics as a field is young (roughly the last several decades).
Before the 19th century, monarchies and feudal structures dominated, with economies often oriented toward conquest rather than sustained growth.
A pivotal historical shift occurred in the late 1600s–1700s when certain governments shifted power toward merchants, enabling trade-led growth:
Netherlands (Holland): a king (referred to as King William by the lecturer) empowered merchants to trade; this led to a “golden era” of growth as merchants accumulated wealth and expanded trade.
The United Kingdom later adopted merchant-driven growth, contributing to the rise of the British Empire.
The Industrial Revolution began in the UK, driven by technological innovations such as the steam engine, which allowed steamships and factories to operate more efficiently and at larger scale. The lecturer notes a linkage: Dutch reforms set the stage for merchant-driven growth; British innovations fueled industrial development.
A cautionary note: the lecturer labels this as historical perspective and acknowledges potential simplifications in the described sequence (e.g., a named figure “Bronell” credited with steam engine discovery in the UK, which is historically contested or misnamed in popular summaries).
The broader point: economic growth is tied to changes in institutions (e.g., property rights, merchants’ power) and technology, not just to raw resources.
Production, resources, and the trade-offs faced by economies
Economic growth requires more of the four factors of production: land, labor, capital, and entrepreneurial ability; at least two typically need to rise for growth to occur.
Land is often fixed in the short run; exceptions exist (e.g., the Netherlands with land reclamation using dykes; a historical note on land expansion vs sea barriers).
Technology tends to increase productivity, allowing existing resources to produce more output with less labor.
Modern concerns: AI and automation can boost productivity but may also lead to job displacement across sectors (e.g., driverless vehicles, robotics, automation in manufacturing).
Capital versus labor considerations: capital goods (plant, machinery, equipment) are used to produce consumer goods; investing in capital often reduces current consumption but raises future productive capacity.
Guns versus butter metaphor:
Trade-off between military spending (guns) and consumer goods (butter).
A broader version: trade-off between capital goods (to expand future production) and consumer goods (current consumption).
Capital vs consumer goods trade-off illustrated: increasing capital investment today can yield higher future output, while higher current consumption reduces resources available for investment.
In macro terms, a country’s saving rate affects investment levels and growth:
Higher saving (and investment) tends to boost future growth, while lower saving shifts resources toward current consumption.
The savings rate is a key determinant of how much can be invested domestically.
The US example (as discussed by the lecturer): historically lower savings rate (around 6 ext{ ext{%}}) compared with other industrialized countries; however, the US benefits from large, highly liquid capital markets and substantial foreign capital inflows (foreign direct investment, FDI) that support investment despite a lower saving rate.
China’s saving rate cited as around 20 ext{ ext{%}}; Japan and other industrialized nations also show higher saving rates relative to the US.
Foreign capital inflows help finance investment when domestic savings are insufficient.
The desert island analogy: understanding growth through opportunity costs
A thought experiment with three people stranded on a desert island illustrates production choices:
Options: forage for berries and water and loaf on the beach (low output, low efficiency), or build tools and shelter and fish (higher potential output).
Interpretations from the analogy:
The situation represents a move from inefficiency to greater efficiency and closer to potential output.
The concept of “potential output” is the maximum sustainable output the economy could produce with given resources and technology.
The shift from inefficient to efficient production corresponds to moving toward the production possibilities frontier (PPF).
The broader lesson: to achieve higher long-run growth, an economy should invest resources (e.g., savings, capital accumulation, technology) to move outward on the PPF, increasing the economy’s capacity to produce goods and services in the future.
Key metrics and real-world implications
Real GDP and real GDP per capita are central metrics:
Growth can come from more inputs (labor, capital, land) or from better technology and efficiency.
Development requires not just higher output but improvements in health, education, infrastructure, and living standards.
The role of investment and savings:
Investment is funded by savings; higher savings can lead to more capital formation and higher future output.
In open economies, foreign direct investment (FDI) can compensate for a low domestic saving rate by bringing in external capital for investment.
The role of institutions and policy history:
Institutional changes that empower merchants and foster trade can catalyze growth (as historical reflection on the Netherlands and the UK suggests).
Technological breakthroughs (e.g., steam engine, factory-based production) drastically change productivity and the structure of the economy.
Ethical, philosophical, and practical implications discussed
Growth vs development: policy relevance lies in ensuring that growth translates into broad-based improvements in living standards, not just higher aggregate output.
Inequality and distribution: growth can occur in some sectors or groups while others are left behind; development aims to reduce poverty and improve access to services for the whole population.
Automation and employment: new technologies raise productivity but may threaten jobs; policy response includes retraining, education, and social safety nets.
Public finance and social welfare: debates on whether to maintain high levels of public spending (e.g., education, healthcare) versus cutting back to balance budgets.
Environmental and quality-of-life considerations: beyond GDP, factors like health, education, environmental quality, and happiness matter for true well-being.
Summary of core ideas
Economic growth is important because it tends to accompany improvements in living standards, health, education, and well-being, not just higher incomes.
Real GDP growth measures total output; real GDP per capita measures output per person and is often used to assess standard of living more accurately in changing populations.
Economic development goes beyond growth to include long-term improvements in health, infrastructure, and quality of life.
History shows growth accelerating with shifts in institutions and technology (merchant power, industrial revolution), and macroeconomics as a discipline is relatively young.
Growth depends on expanding the four factors of production (land, labor, capital, entrepreneurial ability); technology and saving/investment play key roles in raising future output.
The trade-off between current consumption and future growth is central: more saving and investment today can yield higher output tomorrow, but may reduce current consumption.
Modern economies face new challenges from automation and AI, requiring policies that balance productivity gains with employment opportunities and fair distribution.
Indicators like infant mortality and happiness are useful complements to GDP for assessing living standards across countries.
Notation and formulas used
Real GDP growth rate:
Real GDP per capita growth rate:
Real GDP per capita (definition):
Capital goods vs consumer goods: capital goods = plant machinery and equipment; consumer goods are the goods purchased by households.
Savings and investment relationship (conceptual): in a closed economy, investment roughly equals saving, ; in open economies, foreign investment (FDI) supplements domestic savings.
Guns vs butter metaphor: trade-off between military (guns) and civilian (butter) goods; a broader analogue to the capital vs consumption trade-off in growth models.
Population data and indicators mentioned: example figures include people for Norway and various macro indicators such as 6 ext{ ext{%}} savings rate in the US and 20 ext{ ext{%}} in China.
Time reference for long-run historical view: the past years (birth of Christ through present) as a rough horizon for historical growth discussion.
Historical notes use centuries: and century, indicating different eras of growth and development.