Dissertation

2059 mots 9 pages
ECONOMICS - ELASTICITY

Topic 3: Elasticities of Demand & Supply

Topic 3: Elasticities of Demand & Supply

Chapter 3 Elasticities of demand and supply
(Chapter 4 Begg et. al, Chapter 3, Turley et. al.) TOPIC 3

The price elasticity of demand
…measures the sensitivity of the quantity demanded of a good to a change in its price It is defined as: % change in quantity demanded % change in price
Sandra.kelly@itcarlow.ie

Sandra.kelly@itcarlow.ie

Economics Year 1

TOPIC 3 Page 1

Economics Year 1

Topic 3: Elasticities of Demand & Supply

Topic 3: Elasticities of Demand & Supply

The price elasticity of demand
FORMULA Price Elasticity (Point Method)
Q1 = Original quantity Q2 = New quantity P1 = Original price P2 = New price ΔQ = Change in Quantity ΔQ = Change in Price
Q2 - Q1 Q1 P2 - P1 P1 x 100 x 100 = ΔQ Q ΔP P x 100 x 100

Elastic demand
• Demand is ELASTIC – when the price elasticity is greater than -1
• (often the minus sign is ignored)

NB: YOU WILL NOT BE GIVEN THIS FORMULA IN THE EXAM
Sandra.kelly@itcarlow.ie

– i.e. when the % change in quantity demanded exceeds the % change in price • e.g. if quantity demanded falls by 7% in response to a 5% increase in price • elasticity is -7 ÷ 5 = -1.4
Sandra.kelly@itcarlow.ie

TOPIC 3 Page 2

Economics Year 1

TOPIC 3 Page 3

Economics Year 1

Topic 3: Elasticities of Demand & Supply

Topic 3: Elasticities of Demand & Supply

Inelastic demand
• Demand is INELASTIC – when the price elasticity lies between -1 and 0 – i when the % change in quantity i.e. h h h i i demanded is smaller than the % change in price • e.g. if quantity demanded falls by 3.5% in response to a 5% increase in price • elasticity is -3.5 ÷ 5 = - 0.7
Sandra.kelly@itcarlow.ie

Unit elastic demand
• Demand is UNIT ELASTIC – when the price elasticity is exactly -1 – i.e. when the % change in quantity g q y demanded is equal to the % change in price • e.g. if quantity demanded falls by 5% in response

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