Economic Growth, the Financial System, and Business Cycles: Study Notes

Economic Growth, the Financial System, and Business Cycles

10.1 Long-Run Economic Growth

Long-run economic growth refers to the sustained upward trend in the economy’s output over time, typically measured by increases in real GDP per capita. This growth is crucial for improving the average standard of living and is distinct from short-run fluctuations known as the business cycle.

• Real GDP per capita: The total output of the economy divided by the population, adjusted for inflation. It is the most common measure of average living standards.

• Business cycle: Alternating periods of economic expansion and recession.

• Importance: Higher real GDP per capita allows for greater consumption of goods and services, improved health, and more leisure time.

• Example: Since 1900, real GDP per capita in the United States has increased more than nine-fold, reflecting significant improvements in living standards.

Economic Prosperity and Health

• Richer nations can allocate more resources to healthcare, leading to longer lifespans and healthier, more productive citizens.

• Economic growth also allows for more leisure time as productivity increases and lifespans lengthen.

Calculating Growth Rates

• The growth rate of an economic variable (e.g., real GDP) is the percentage change from one year to the next.

• For multi-year periods, the average annual growth rate can be calculated by averaging yearly rates or using the formula for compound growth:

$\text{Growth Rate} = \frac{\text{Value}_{\text{current}} - \text{Value}_{\text{previous}}}{\text{Value}_{\text{previous}}} \times 100\%$

For longer periods, solve for $g$ in:

$\text{Value}_{t} = \text{Value}_{0} (1 + g)^t$

• Rule of 70: The number of years for a variable to double is approximately $70 / \text{growth rate (in percent)}$.

Determinants of Long-Run Growth

• Labor productivity: The amount of goods and services produced by one worker or one hour of work. Increases in labor productivity are the main driver of long-run growth.

• Factors affecting productivity:

  • Increases in capital per hour worked (physical and human capital)

  • Technological change (new methods, innovations, and entrepreneurship)

  • Secure property rights and effective legal systems

Case Study: India’s Economic Growth

• Market-based reforms since 1991 have significantly increased India’s growth rate.

• Continued growth depends on infrastructure, education, health, and the rule of law.

Potential GDP

• Potential GDP: The level of real GDP when all firms are operating at normal capacity.

• Potential GDP grows with increases in the labor force, capital stock, and technological progress.

• Recessions create a gap between actual and potential GDP.

10.2 Saving, Investment, and the Financial System

The financial system channels funds from savers to borrowers, facilitating investment and long-run economic growth.

• Financial markets: Where securities like stocks and bonds are bought and sold.

• Financial intermediaries: Institutions (banks, mutual funds, etc.) that connect savers and borrowers.

• Services provided:

  • Risk sharing

  • Liquidity (ease of converting assets to cash)

  • Information (about investment opportunities)

Macroeconomics of Savings and Investment

• In a closed economy, GDP ($Y$) is the sum of consumption ($C$), investment ($I$), and government purchases ($G$):

$Y = C + I + G$

• Investment can be expressed as:

$I = Y - C - G$

• Savings: The sum of private savings (by households) and public savings (by the government).

• Private savings: $Y + TR - C - T$

• Public savings: $T - G - TR$

• Total savings: $S = (Y + TR - C - T) + (T - G - TR) = Y - C - G = I$

• Thus, in a closed economy, savings equals investment.

The Market for Loanable Funds

• This market models the interaction of borrowers and lenders, determining the equilibrium interest rate and quantity of loanable funds.

• Firms demand loanable funds for investment; households supply funds through savings.

• Government deficits reduce the supply of loanable funds, raising interest rates and reducing investment (crowding out).

Shifts in the Loanable Funds Market

• Increase in demand: Technological change makes investment more profitable, increasing demand for loanable funds, raising interest rates and quantity loaned.

• Budget deficit: Government borrowing reduces the supply of loanable funds, raising interest rates and reducing investment (crowding out).

Summary Table: Loanable Funds Model

Event	Effect on Interest Rate	Effect on Investment
Increase in demand for loanable funds	Interest rate rises	Investment rises
Increase in supply of loanable funds	Interest rate falls	Investment rises
Government budget deficit	Interest rate rises	Investment falls (crowding out)
Government budget surplus	Interest rate falls	Investment rises

10.3 The Business Cycle

The business cycle refers to the recurring pattern of economic expansions and recessions observed in market economies.

• Expansion: Period when real GDP is rising.

• Recession: Period when real GDP is falling.

• Peak: The point at which expansion ends and recession begins.

• Trough: The point at which recession ends and expansion begins.

Identifying Recessions

• Common media definition: Two consecutive quarters of declining real GDP.

• National Bureau of Economic Research (NBER) definition: A significant decline in economic activity spread across the economy, lasting more than a few months.

Features of the Business Cycle

• Near the end of expansions, interest rates and wages rise, but firm profits fall.

• During recessions, investment and consumption decline, leading to higher unemployment.

• Recovery begins as firms and households anticipate future growth and increase spending.

Inflation and the Business Cycle

• Inflation tends to rise during expansions and fall during recessions.

• During recessions, inflation may slow or even turn into deflation.

Unemployment and the Business Cycle

• Unemployment rises during recessions as firms cut production and lay off workers.

• Unemployment often continues to rise even after a recession ends.

Impact on Younger Workers

• Younger workers are often more severely affected by recessions, with lower employment rates compared to older workers.

Predicting Recessions

• Economists struggle to predict recessions due to the non-uniform nature of business cycles, unreliable leading indicators, and unpredictable triggering events.

Fluctuations in Real GDP

• Annual fluctuations in real GDP were larger before 1950; since then, business cycles have become milder, especially since the mid-1980s (the "Great Moderation").

Explaining the Great Moderation

• Greater importance of services (less affected by recessions than manufacturing).

• Establishment of unemployment insurance and transfer programs, which stabilize consumption.

• Active government stabilization policies to manage expansions and recessions.

• Increased stability of the financial system.

Additional info: The chapter integrates real-world examples, such as the impact of the Great Recession and the Covid-19 pandemic, to illustrate the effects of economic growth and business cycles on different generations and sectors of the economy.