Economics
Economics
This domain tests scarcity, opportunity cost, markets, macro indicators, policy, trade, and personal finance. Questions often ask you to apply a model rather than recall a definition.
Core tools
- Scarcity and choice: every choice has an opportunity cost-the value of the next-best alternative.
- Marginal analysis: compare additional benefit with additional cost.
- Supply and demand: price ceilings below equilibrium create shortages; price floors above equilibrium create surpluses.
- Macro indicators: GDP measures final goods and services produced domestically; CPI tracks consumer prices; unemployment includes frictional, structural, and cyclical types.
- Policy: fiscal policy uses government spending and taxes; monetary policy uses interest rates and money supply, typically through a central bank.
- Trade: comparative advantage explains gains from specialization, even when one country is more productive in everything.
Worked example
A city sets rent control below the market equilibrium. What happens? At the lower legal price, quantity demanded rises and quantity supplied falls, creating a shortage. Landlords may reduce maintenance, convert units, or exit the market; tenants may stay longer. The model predicts shortages and quality erosion, not necessarily zero housing. The size depends on elasticity: if demand is inelastic, the shortage is smaller. A strong answer uses supply, demand, and elasticity-not a political slogan.
Traps
- Confusing GDP with national well-being.
- Treating inflation as making everyone poorer equally.
- Mixing fiscal and monetary policy.
- Assuming price controls create abundance.