Introduction
[Point] Income elasticity of demand (YED) measures the responsiveness of the quantity demanded of a given good to a change in consumers’ income, ceteris paribus. It is calculated using the formula YED = % Change in Dd / % Change in Y. It provides information on the direction and magnitude of change in demand given a change in income. A YED > 1 indicates an income-elastic luxury good, 0 < YED < 1 indicates an income-inelastic necessity, and a YED < 0 denotes an inferior good.
[Explanation] Profit-seeking firms would be motivated to find means to increase their Total Revenue (TR), thereby possibly also increasing their economic profits, which is the amount by which Total Revenue exceeds Total Costs. This can be accomplished using the concept of YED. Primary products are products which are in their raw form and have not gone through manufacturing or processing. Examples include coal and agricultural products. Manufactured products are products that have been processed from raw materials, for example consumer products like TVs or cars. Finally, services encompass intangible products, such as aviation and tourism.
The YED Values of Different Product Categories
[Point] The YED for primary products tends to be lower than that of manufactured products and services.
[Explanation] This is because primary products tend to be of the highest degree of necessity, as they are often essential in the production of other goods. For instance, cotton is used in the production of clothing, and basic foodstuffs are essential for survival. As a result, primary products tend to be normal necessity goods, with a YED value between 0 and 1.
[Explanation] On the other hand, manufactured products are often of a lower degree of necessity (higher YED value), followed by services (like entertainment or travel) which have the lowest degree of necessity and oftentimes, considered luxury goods with highly elastic demand (YED > 1).
[Insert Diagram: Figure on different relative extents of shifts in Demand curves for Primary vs Manufactured Goods & Services following an increase in income]
Thesis: Usefulness of YED for Production Strategy
[Point] Knowledge of YED enables a firm to develop dynamic production and marketing strategies, both in terms of the amount of output and the type of good or service. Over time, as countries experience economic growth, the real income per capita is likely to increase, which causes the demand for primary and manufactured goods and services to increase.
[Explanation] The demand for primary goods is likely to increase less than proportionately to the increase in income, whereas the demand for manufactured goods is likely to increase by a greater extent and the demand for services being income elastic will increase more than proportionately. Consequently, this allows producers to decide on an appropriate production strategy. In times of economic growth, producers of primary products will want to increase output but not drastically. In contrast, producers of manufactured goods and especially services should seek to expand output by a lot more. This will allow them to realise significantly more sales and hence revenue and profits.
[Exemplification] For example, coffee growers may want to produce more Arabica beans as demand increases even more. Hence, coffee producers could sell coffee made from the more premium Arabica beans, instead of the more common Robusta beans. Producers of manufactured goods might also be incentivised to expand into the production of products that are considered more luxury or high-class. The aviation industry exhibits highly elastic YED; during economic booms, airlines like Singapore Airlines experience a massive surge in demand for premium First and Business Class services.
[Evaluation – The Converse] The converse holds true in times of an economic downturn. During a recession, a firm should consider focusing on the production of normal necessity goods (for which the decrease in demand is less than proportionate), or even inferior goods (whose demand actually increases). A coffee grower may choose only to produce Robusta beans. Service producers must rely heavily on their budget subsidiaries, such as Scoot, to capture the shifting market. Furthermore, during the 2008 financial crisis, discount retailers like Aldi and Lidl saw record profits as falling real incomes forced consumers to substitute away from expensive supermarkets toward cheaper alternatives.
[Exemplification] Large companies should consider producing a range of products with different YED values for greater revenue and profit stability. For example, the Volkswagen Group sells a large variety of vehicles, including luxury passenger cars under brands such as Bentley, Lamborghini and Porsche, as well as more pedestrian offerings under brands like SEAT or Skoda. The Group also sells commercial vehicles such as trucks. These vehicles vary widely in YED – luxury vehicles have a YED value that is positive and greater than one, whereas its mass-market brands have a YED that is below 1 or even negative. This allows the company as a whole to be versatile – the company can easily vary the focus in terms of production according to changes in income, thereby ensuring stability in sales and profitability regardless of economic performance.
💡 Chief Tutor’s Tip:
This section is an absolute goldmine for Application marks. By providing specific, globally recognized brands (VW Group, SIA/Scoot, Aldi/Lidl) and detailing how the “converse holds true” during downturns, you prove to the examiner that you understand how YED dictates tangible corporate survival strategies.
Anti-Thesis: Limitations of YED Analysis
[Point & Explanation] However, YED data might not be completely accurate, and strictly relying on it carries significant risks. It is hard for market research and economic studies to accurately simulate consumers’ behaviour in reaction to changes in income. Furthermore, conducting such research and studies takes long periods of time – consequently, the collated data might already be out-of-date and hence inaccurate by the time the firm decides to act on them.
[Point & Explanation] Knowledge of YED might be insufficient to determine consumption effects, since the ceteris paribus assumption often does not hold true in real life. When planning its product line-up and production quantities, a firm has to assess not only changes in income levels but also take into consideration other factors that might have an impact on the demand for its product. For example, an increase in a nation’s income might imply a rise in the demand for technologically advanced televisions, but consumers will have a range of brands from which to choose. Some firms could experience little effect on sales if consumers have a preference for substitute brands. Hence, firms need to take into account of other factors such as consumer tastes and preferences, and not merely YED values.
[Point & Explanation] The use of YED is mainly geared towards increasing revenues. However, to maximise profits, costs of production also have to be considered. By widening the range of products and also by producing more luxury versions, higher unit costs of production may be incurred, which could erode profit margins. Finally, as production and marketing strategies take time to implement, firms may attempt to use economic growth forecasts to make their decisions. However, such forecasts may be inaccurate, leading to wrong decisions that reduce profits instead.
[Insert Diagram: Draw Firm diagram showing an increase in costs outweighing increase in Demand, causing a fall in profits.]
Concluding Section
[Conclusion] While knowledge of YED is highly valuable as it does provide a firm with useful and relevant information to help achieve its goals, there are strict limitations to its application. The knowledge of YED is arguably most vital for firms in the manufacturing and services sectors, as their highly elastic demand makes them vastly more sensitive to macroeconomic fluctuations.
Furthermore, YED is not static; it is subject to constant Change over time. What is considered a luxury good today often becomes a normal necessity tomorrow as technology penetrates society and global incomes rise. Therefore, basing long-term capital investments solely on current YED categorizations can lead to market misalignment.
Ultimately, to successfully navigate complex global markets, knowledge of other elasticities, such as the price elasticity of demand (PED) and cross elasticity of demand (XED) would also be important in guiding the firm’s strategies, as many factors have to be taken into account.
Stop merely memorizing textbook definitions. Want to learn how to generate Grade 7 evaluation points and weave IB Key Concepts into your essays like the one above? Join our IB Economics Tuition Masterclasses or return to the IB Economics Model Essays.