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Understand market equilibrium, determine price, identify surplus, shortage, efficiency; analyze shifts in supply and demand curves affecting equilibrium. Detailed graphs included.
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Demand and supply analysis Market equilibrium and Efficiency
What is Market Equilibrium • It occurs at the price where the quantity demanded and quantity supplied are equal • Also called the “market-clearing price” – everything put on the market, at that price, is sold
The Determination of Price • Equilibrium price and output • response to shortages and surpluses • significance of “equilibrium” • Demand and supply curves
Equilibrium price and output:The Market Demand and Supply of Potatoes (Monthly)
The determination of market equilibrium(potatoes: monthly) e E Supply d D c C Price (pence per kg) b B a A Demand Quantity (tonnes: 000s)
The Determination of Price • Equilibrium price and output • response to shortages and surpluses • significance of “equilibrium” • Demand and supply curves • effect of price being above equilibrium
The Determination of Price • Equilibrium price and output • response to shortages and surpluses • significance of “equilibrium” • Demand and supply curves • effect of price being above equilibrium • surplus price falls
The determination of market equilibrium(potatoes: monthly) SURPLUS (330 000) e E Excess Supply or Supply d D c C Price (pence per kg) b B a A Demand Quantity (tonnes: 000s)
The Determination of Price • Equilibrium price and output • response to shortages and surpluses • significance of “equilibrium” • Demand and supply curves • effect of price being above equilibrium • surplus price falls • effect of price being below equilibrium
The Determination of Price • Equilibrium price and output • response to shortages and surpluses • significance of “equilibrium” • Demand and supply curves • effect of price being above equilibrium • surplus price falls • effect of price being below equilibrium • shortage price rises
The determination of market equilibrium(potatoes: monthly) SHORTAGE (300 000) e E Supply d D c C Price (pence per kg) b B a Or Excess Demand A Demand Quantity (tonnes: 000s)
The Determination of Price • Equilibrium price and output • response to shortages and surpluses • significance of “equilibrium” • Demand and supply curves • effect of price being above equilibrium • surplus price falls • effect of price being below equilibrium • shortage price rises • equilibrium: where D = S
The determination of market equilibrium(potatoes: monthly) e E Supply d D Price of 60 is the market clearing price Price (pence per kg) b B a A Demand Qe Quantity (tonnes: 000s)
The Determination of Price • Effects of shifts in the demand curve • movement along S curve and new D curve • rise in demand (rightward shift) P rises • fall in demand (leftward shift) P falls
Effect of a shift in the demand curve An increase in demand P S g Pe1 D1 O Qe1 Q
Effect of a shift in the demand curve P S g Pe1 D1 O Qe1 Q
Effect of a shift in the demand curve P S g Pe1 D2 D1 O Qe1 Q
Effect of a shift in the demand curve i h P S As producers realize they can raise the price, they produce more, a movement upwards along the S curve. As consumers see the higher prices, they decrease the qty demanded, a movement up & left along the new D curve. Pe2 g Pe1 D2 D1 O Qe1 Qe2 Q
Effect of a shift in the demand curve A decrease in demand D2 P S g Pe1 D1 O Qe1 Q
Effect of a shift in the demand curve m n P S A decrease in D results in surplus; producers will then cut prices to entice buyers (increasing qty demanded, moving down along the D curve. g Pe1 Pe2 D2 D1 O Qe1 Qe2 Q
The Determination of Price • Effects of shifts in the demand curve • movement along S curve and new D curve • rise in demand (rightward shift) P rises • fall in demand (leftward shift) P falls • Effects of shifts in the supply curve
The Determination of Price • Effects of shifts in the demand curve • movement along S curve and new D curve • rise in demand (rightward shift) P rises • fall in demand (leftward shift) P falls • Effects of shifts in the supply curve • movement along D curve and new S curve
The Determination of Price • Effects of shifts in the demand curve • movement along S curve and new D curve • rise in demand (rightward shift) P rises • fall in demand (leftward shift) P falls • Effects of shifts in the supply curve • movement along D curve and new S curve • rise in supply (rightward shift) P falls
The Determination of Price • Effects of shifts in the demand curve • movement along S curve and new D curve • rise in demand (rightward shift) P rises • fall in demand (leftward shift) P falls • Effects of shifts in the supply curve • movement along D curve and new S curve • rise in supply (rightward shift) P falls • fall in supply (leftward shift) P rises
Effect of a shift in the supply curve A decrease in supply P S1 g Pe1 D O Qe1 Q
Effect of a shift in the supply curve P S1 g Pe1 D O Qe1 Q
Effect of a shift in the supply curve P S2 S1 g Pe1 D O Qe1 Q
Effect of a shift in the supply curve k j P S2 S1 The reduce supply causes a shortage at the old equilibrium price. Producers therefore begin to increase prices & consumers respond by decreasing the qty demanded. Pe3 g Pe1 D O Qe3 Qe1 Q
Effect of a shift in the supply curve S2 An increase in supply P S1 g Pe1 D O Qe1 Q
Effect of a shift in the supply curve q P S1 S2 g p Pe1 Pe2 D O Qe2 Qe1 Q
Using fully labeled diagrams, illustrate what will happen to the equilibrium price and quantity in each of the situations, and then explain what has happened.
There has been a health scare relating to the consumption of chicken.
Effect of a shift in the demand curve A decrease in demand P S Pe1 Pe2 D2 D1 O Qe1 Qe2 Q
There has been an increase in the costs of production in the motorcycle industry.
Effect of a shift in the supply curve A decrease in supply P S1 g Pe1 D O Qe1 Q
Effect of a shift in the supply curve P S1 g Pe1 D O Qe1 Q
Effect of a shift in the supply curve P S2 S1 g Pe1 D O Qe1 Q
Effect of a shift in the supply curve k j P S2 S1 Pe3 g Pe1 D O Qe3 Qe1 Q
There has been an improvement in production technology in the textile industry.
Effect of a shift in the supply curve S2 An increase in supply P S1 g Pe1 D O Qe1 Q
Effect of a shift in the supply curve q P S1 S2 g p Pe1 Pe2 D O Qe2 Qe1 Q
Manufacturers in the sportswear industry have decided to raise the price of training shoes.
Increase in Price SURPLUS An increase in price P S P1 P e D1 O Qe Q2 Q1 Q
Price Mechanism Forces of supply and demand move markets to equilibrium Helps to allocate scarce resources Resources are allocated and re-allocated in response to changes in price If there is an increase in the price of a good, due to an increase in demand for the good, this gives a ‘signal’ to producers that consumers wish to buy this good Higher price will give producers an incentive to produce more of a good
Effect of a shift in the demand curve i h P As producers realize they can raise the price, they produce more, a movement upwards along the S curve. As consumers see the higher prices, they decrease the qty demanded, a movement up & left along the new D curve. New higher equilibrium price signals product scarcity. S Pe2 g Pe1 D2 D1 O Qe1 Qe2 Qe3 Q
Effect of a shift in the supply curve S2 An increase in supply P S1 g Pe1 D O Qe1 Q
Effect of a shift in the supply curve q P S1 S2 g p Pe1 Pe2 D O Qe2 Qe1 Q3 Q
Answer Worksheet 3.2 Questions Gas Prices: From Disequilibrium to Equilibrium