Key Determinants of National Economic Variables
Factors Affecting Consumer Spending
A nation’s consumer spending is affected by:
- Current Disposable Income: Measured using the Average Propensity to Consume (APC) and Average Propensity to Save (APS).
- Permanent Income: Based on the life-cycle model, measured using the Marginal Propensity to Consume (MPC) and Marginal Propensity to Save (MPS).
- Wealth: Calculated as assets minus liabilities (e.g., home equity minus mortgage) of a country, representing the sum total of individual residents’ wealth.
Components and Influences on Investment
Investment is composed of:
- Purchase of buildings.
- Equipment (machinery and production tools).
- Additions to stock (or inventory) of inputs and output.
Investment decisions are affected by:
- Revenues: Firms invest if they