Summary
The interaction of demand and supply determines the equilibrium in a market, where the quantity demanded equals the quantity supplied, resulting in a stable price and quantity. Changes in demand or supply can shift the equilibrium, affecting prices and quantities traded.
- Equilibrium — a state where the quantity demanded equals the quantity supplied. Example: At equilibrium, the market price stabilizes as the amount consumers want to buy matches what producers offer.
- Demand Curve Shift — a change in the quantity demanded at every price level. Example: An increase in demand shifts the demand curve right, leading to higher prices and quantities.
- Supply Curve Shift — a change in the quantity supplied at every price level. Example: An increase in supply shifts the supply curve right, causing prices to fall and quantities to rise.
- Price Mechanism — the process by which prices adjust due to changes in supply and demand. Example: Higher demand raises prices, signaling producers to increase supply.
Exam Tips
Key Definitions to Remember
- Equilibrium
- Demand Curve Shift
- Supply Curve Shift
- Price Mechanism
Common Confusions
- Confusing equilibrium with just any price level
- Misunderstanding how simultaneous shifts in demand and supply affect equilibrium
Typical Exam Questions
- What is equilibrium in a market? Equilibrium is when the quantity demanded equals the quantity supplied.
- How does an increase in demand affect equilibrium price and quantity? It raises the equilibrium price and increases the quantity traded.
- What happens to equilibrium when both demand and supply increase? The quantity traded increases, but the price may remain unchanged.
What Examiners Usually Test
- Ability to illustrate and explain equilibrium on a graph
- Understanding of how shifts in demand and supply affect equilibrium
- Application of the price mechanism in different market scenarios