Economic Growth and Business Cycles: Key Determinants

Economic Growth Fundamentals

Economic growth is defined by the formula: Y_t = Y₀(1 + g)^t, where g represents the growth rate. The Rule of 70 is used to estimate the doubling time of an economy: t = 70 / (g * 100).

Determinants of GDP per Capita

The decomposition of GDP per capita is expressed as:

• Productivity: GDP per hour worked.
• Average hours worked: Hours worked per employed person.
• Employment rate: Employed population relative to the active population.
• Activity rate: Active population relative to the working-age population.
• Demographics: Working-age population relative to the total population.

Capital Accumulation and Productivity

According to the Solow Model, diminishing marginal returns to capital imply that an economy cannot grow indefinitely solely through factor accumulation. The financial system plays a crucial role by transferring resources from savers to investors, facilitating productive capital investment.

Key Growth Drivers

• Foreign Investment: Direct and indirect capital inflows.
• Infrastructure: Physical and digital foundations.
• Institutional Stability: Political stability and property rights protection.
• Tax Systems: Efficiency and incentives for investment.
• Human Capital: Education improves individual productivity and creates equal opportunities.
• Labor Market Institutions: Includes dismissal costs, contract types, collective bargaining, and minimum wage policies.
• Technological Progress: Driven by R&D and patent systems.

Business Cycles and Economic Fluctuations

Economic cycles represent fluctuations of GDP relative to its long-term trend.

Cycle Phases

• Expansion: Period where GDP grows above its trend.
• Recession: Persistent slowing of economic activity, defined as a reduction in GDP over two consecutive periods.

Characterizing Cyclical Behavior

Variables are classified based on their relationship with GDP:

• Direction: Procyclical (moves with GDP), Countercyclical (moves against GDP), or Acyclic (no correlation).
• Amplitude: The degree of variation relative to GDP fluctuations.
• Timing: Leading (changes before GDP), Coincident (changes with GDP), or Lagging (changes after GDP).