Pearson Edexcel · A-Level · Economics B
Course version: 9EB0 · Version from Sept 2015
A) The significance of income elasticity of demand to firms
Full specification wording
Income elasticity of demand (YED): a) The significance of income elasticity of demand to firms
Income elasticity of demand (YED) measures the responsiveness of quantity demanded to a change in consumer income.
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Study notes
From the checked teaching notes for this specification point.
The idea
Income elasticity of demand (YED) measures the responsiveness of quantity demanded to a change in consumer income. For firms, understanding YED is highly significant for strategic planning. If a firm produces normal goods (YED > 0), demand rises during economic growth, allowing for expansion. Conversely, if a firm produces inferior goods (YED < 0), demand falls as incomes rise, but increases during a recession. For example, a supermarket might stock more premium brands (luxury goods, YED > 1) during an economic boom, but switch to own-label value products (inferior goods) during a downturn. Firms use YED to forecast sales, plan production schedules, and adjust their product portfolios to mitigate risks associated with the economic cycle.
What earns the marks
- YED determines whether a product is a normal good (positive YED) or an inferior good (negative YED).
- Firms use YED estimates to forecast future sales based on macroeconomic income forecasts.
- A diversified product portfolio containing both normal and inferior goods can protect a firm against fluctuations in the economic cycle.
- Luxury goods (YED > 1) are highly sensitive to income changes, meaning firms selling these face greater volatility during recessions.
Common mistakes and how to put them right
Confusing YED with price elasticity of demand (PED).
Put it right: YED measures responsiveness to income changes, not price changes.
Assuming all normal goods are luxury goods.
Put it right: Normal goods can be necessities (YED between 0 and 1) or luxuries (YED greater than 1).
Believing that a negative YED means the firm is making a loss.
Put it right: It simply means the good is inferior and demand moves inversely to income.
Exam tips
- Always state whether the YED value indicates a normal, luxury, or inferior good when evaluating its significance to a firm.
- Use the economic cycle (booms and recessions) as context when explaining how firms use YED for strategic planning.
- Remember that YED estimates are based on historical data and ceteris paribus assumptions, which may limit their accuracy for future forecasting.
Try the lesson
The start of the Income elasticity of demand (YED): a) The significance of income elasticity of demand to firms lesson, made from checked teaching notes for this specification point.
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Why is knowledge of income elasticity of demand (YED) particularly significant for a firm during an economic recession?
Listen
Income elasticity of demand (YED) measures the responsiveness of quantity demanded to a change in consumer income. For firms, understanding YED is highly significant for strategic planning. If a firm produces normal goods (YED > 0), demand rises during economic growth, allowing for expansion. Conversely, if a firm produces inferior goods (YED < 0), demand falls as incomes rise, but increases during a recession. For example, a supermarket might stock more premium brands (luxury goods, YED > 1) during an economic boom, but switch to own-label value products (inferior goods) during a downturn. Firms use YED to forecast sales, plan production schedules, and adjust their product portfolios to mitigate risks associated with the economic cycle. A strong answer earns marks for these points. YED determines whether a product is a normal good (positive YED) or an inferior good (negative YED). Firms use YED estimates to forecast future sales based on macroeconomic income forecasts. A diversified product portfolio containing both normal and inferior goods can protect a firm against fluctuations in the economic cycle. Luxury goods (YED > 1) are highly sensitive to income changes, meaning firms selling these face greater volatility during recessions. Exam tip: Always state whether the YED value indicates a normal, luxury, or inferior good when evaluating its significance to a firm.
Key words
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Strategic planning
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Economic cycle
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Product portfolio management
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See every definition
- Strategic planning
- Using understanding of income elasticity of demand to decide on expansion, sales forecasting and production schedules.
- Economic cycle
- The pattern of booms and recessions during which demand for normal and inferior goods moves in opposite directions.
- Product portfolio management
- Adjusting the mix of products a firm offers, such as premium brands in a boom and own-label value products in a downturn, to mitigate risks.
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