Business Economics
Business economics applies microeconomic and macroeconomic reasoning to firm decisions. Candidates must understand demand and supply, elasticity, cost structures, market structures (perfect competition, monopoly, monopolistic competition, oligopoly), and the macro environment - inflation, interest rates, GDP, and exchange rates. Grasp how price elasticity of demand affects pricing and revenue, and how fixed and variable costs drive break-even and operating leverage.
Traps to watch
- Confusing a movement along the demand curve (price change) with a shift (income, tastes, substitutes).
- Assuming higher price always raises revenue - with elastic demand, a price rise reduces total revenue.
- Mixing up economies of scale (falling long-run average cost) with diminishing returns (short-run).
- Forgetting that in perfect competition firms are price takers.
Worked example
If price elasticity of demand is 2 (elastic) and price rises 10%, quantity demanded falls roughly 20%, so total revenue falls. Conversely, with inelastic demand (elasticity 0.5), a 10% price rise cuts quantity only 5%, raising revenue. Rule of thumb: raise price when demand is inelastic; cut price when demand is elastic to grow revenue.
Market structures
Fewer competitors and higher barriers generally mean more pricing power; perfect competition erodes abnormal profit in the long run.