Elasticity of demand Flashcards
Price elasticity of demand (PED)
Measures the sensitivity of consumers demand to a change in the price of good/service
Income elasticity of demand (YED)
Measures the sensitivity of consumers demand to a change in consumer income
Cross elasticity of demand (XED)
Measures the sensitivity of the demand for one good following a change in the price of another good/service
Elastic diagram looks like…
E horizontal line
Inelastic diagram looks like…
I Vertical line
Factors the determine PED
-Availability of substitutes
-Necessity or luxury
-Percentage of income
-Time
PED calculation
PED=percentage change in quantity demanded/percentage change in price
Percentage change
new-old/original *100
PED=0
Perfectly inelastic
PED=1
Unitary elastic
PED=infinite (0/0)
Perfectly elastic
Price inelastic
0-1
Price elastic
1-infinite
Where is elasticity most elastic
Most elastic at the top (socks)
YED normal goods
Positive relationship + sign
YED inferior goods
Negative relationship - sign
The number (YED)
The bigger the number the more income elastic it is
YED equation
YED=percentage change in quantity demanded/percentage change in income
XED equations
XED=percentage change in quantity demanded of good B/good A
XED +sign
substitute
XED -sign
compliments
Totally unrelated
0
weak relationship
0-1
strong relationship
1-infisnite