Economics – Price elasticity, income elasticity and cross elasticity of demand | e-Consult
Price elasticity, income elasticity and cross elasticity of demand (1 questions)
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Calculation of Cross Elasticity:
Cross elasticity of demand (XED) is calculated as: XED = (% Change in Quantity Demanded of Good A) / (% Change in Price of Good B)
In this case: XED = (-5%) / (10%) = -0.5
Interpretation:
The cross elasticity of demand is -0.5. Since the value is negative, coffee and tea are complementary goods. This means that an increase in the price of coffee leads to a decrease in the quantity demanded of tea. This is consistent with the goods being consumed together. When the price of one good rises, the demand for the other falls because consumers tend to reduce their consumption of the more expensive good and switch to the cheaper alternative.
Limitations:
- Only reflects direct relationships: Cross elasticity only measures the relationship between two specific goods. It doesn't capture the broader economic factors that might influence demand.
- Assumes goods are substitutes/complements: The calculation assumes a direct relationship between the goods. If the relationship is indirect or influenced by other factors (e.g., changing tastes, income), the cross elasticity might not accurately reflect the true strength of the relationship.
- Doesn't indicate the magnitude of the relationship: While the sign indicates the type of relationship (complementary/substitutes), the magnitude of the coefficient doesn't necessarily indicate the strength of the relationship. A small absolute value might still represent a significant relationship in practice.