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SingaporeEconomics

Price Determination and Elasticity

5 dot points across 5 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

Why do firms and governments need to know how elastic demand and supply are?

Apply elasticity to pricing decisions, taxation, and the size of price changes in real markets
A clear O-Level answer on applying elasticity. How firms use PED to set prices, how governments use it to choose what to tax, and how elasticity decides whether a shift changes mostly price or mostly quantity.
8 min answer →

How does demand respond to a change in income, or to a change in the price of another good?

Define income elasticity and cross elasticity of demand, calculate them, and interpret their signs
A clear O-Level answer on income and cross elasticity of demand. The two formulas, how the sign of YED shows a normal or inferior good, and how the sign of XED shows substitutes or complements.
8 min answer →

How do demand and supply together set a single market price, and what happens when they shift?

Explain how equilibrium price and quantity are determined, and how shifts in demand and supply change them
A clear O-Level answer on market equilibrium. How shortages and surpluses push price to equilibrium, the four single-shift cases, and how to analyse a change in price and quantity step by step.
8 min answer →

How strongly does the quantity demanded respond when the price changes?

Define price elasticity of demand, calculate it, and explain the factors that determine it
A clear O-Level answer on price elasticity of demand. The PED formula, how to tell elastic from inelastic demand, the factors that determine it, and how PED links to a firm's total revenue.
9 min answer →

How strongly does the quantity supplied respond when the price changes?

Define price elasticity of supply, calculate it, and explain the factors that determine it
A clear O-Level answer on price elasticity of supply. The PES formula, how to tell elastic from inelastic supply, the factors that determine it including the time period, and why some goods cannot respond quickly to price.
8 min answer →