Economics and Personal Finance
What the domain tests
Economics and personal finance questions cover scarcity, opportunity cost, supply and demand, elasticity, market structures, macroeconomic indicators, policy, budgeting, credit, saving, investing, and insurance.
Core rules
- Scarcity forces choices; opportunity cost is the value of the next-best alternative. Sunk costs should not affect forward-looking decisions.
- Demand is the relationship between price and quantity demanded, other things equal. A change in price causes movement along the curve; changes in income, tastes, prices of substitutes, or expectations shift the curve. Supply works the same way.
- Equilibrium occurs where quantity supplied equals quantity demanded. A price ceiling below equilibrium creates a shortage; a price floor above equilibrium creates a surplus.
- Elasticity measures responsiveness. If demand is elastic, a price increase lowers total revenue; if inelastic, a price increase raises total revenue.
- GDP is the market value of final goods and services produced within a country in a period; intermediate goods are excluded. Inflation is a sustained rise in the general price level; unemployment types include frictional, structural, and cyclical.
- Monetary policy is central-bank action on money supply and interest rates; fiscal policy is government taxation and spending.
- Personal finance: budget income minus expenses; compare APR, not just monthly payment; diversify investments; insurance transfers risk.
Worked example
A city caps apartment rent below the market equilibrium. At the ceiling, quantity demanded exceeds quantity supplied, so a shortage appears. Landlords may reduce maintenance or exit the market, and tenants may search longer. The reasoning is that the ceiling is a legal maximum price, not a shift in supply or demand; the shortage is caused by the price being held below equilibrium.
Traps
Do not confuse a shift in demand with movement along demand. GDP excludes intermediate goods and transfer payments. Unexpected inflation generally hurts lenders and savers and helps fixed-rate borrowers. A price floor is a minimum, not a maximum. Correlation in economic data is not causation.