Module III·Article IV·~3 min read
Practical Applications of Elasticity
Elasticity
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Practical applications of elasticity Elasticity is not an abstract theory but a practical tool. Business uses it for pricing, the state—for tax policy, investors—for company analysis. Let us consider specific applications.
Pricing and Revenue Maximization
Relationship between elasticity and revenue:
|PED| > 1: lower the price—revenue will grow
|PED| < 1: raise the price—revenue will grow
|PED| = 1: revenue is maximized
To maximize profit (not revenue) costs must be taken into account. The optimal price is where MR = MC.
Relationship between MR and elasticity:
$ MR = P(1 + 1/PED) = P(1 - 1/|PED|) $
Lerner index: a measure of market power:
$ (P - MC) / P = 1 / |PED| $
The less elastic the demand, the higher the markup over costs.
Price Discrimination
Idea: different consumers have different elasticities. If it is possible to segment markets—you can set different prices.
Rule: higher price for segment with inelastic demand, lower—for elastic one.
Examples:
- Airline tickets: business travelers (inelastic demand) pay more, tourists (elastic)—less
- Movie theaters: discounts for students and pensioners (more elastic)
- Medicines: high prices in wealthy countries, low in poor ones
- Software: discounts for education
Conditions for discrimination: market power, ability to segment market, impossibility of arbitrage between segments.
Industry Analysis
Elasticity and industry structure:
High price elasticity of demand (many substitutes, competition):
- Low markups
- Margin pressure
- Importance of costs
- Price wars
Low price elasticity of demand (unique product, barriers):
- High markups
- Stable margin
- Pricing power
- Protection from cost inflation
Porter's 5 Forces analysis can be reformulated in terms of elasticities: buyer power—demand elasticity; supplier power—elasticity of supply of resources; threat of substitutes—cross-elasticity.
Forecasting and Modeling
Elasticity estimation:
- Econometric methods: regression of price and quantity with control for other factors. Requires data, endogenous variable problem is complex.
- Experiments: A/B price tests. Reliable, but limited.
- Surveys: conjoint analysis—assessment of willingness to pay. Subjective, but useful for new products.
Uses of estimates:
- Sales forecasting with price changes
- Modeling competitive scenarios
- Assessment of the influence of macro factors (income, resource prices)
Tax Policy
Choice of tax base:
- Taxes on inelastic goods (cigarettes, alcohol, gasoline) raise a lot of money with minimal DWL
- But may be regressive
Pigouvian taxes: taxes on goods with negative externalities (pollution). Elasticity determines how much a tax reduces consumption.
Revenue forecasting: with inelastic demand, raising the rate proportionally increases revenue. With elastic demand—it may fall.
Macroeconomic Applications
Elasticity of imports/exports: affects trade balance when exchange rate changes. Marshall-Lerner condition: devaluation improves balance if sum of elasticities > 1.
Elasticity of saving with respect to the rate: affects the effectiveness of monetary policy.
Elasticity of investment with respect to the rate: determines how sensitive the economy is to changing rates.
Case: The Oil Market
Short-run elasticity of oil demand: very low (~0.1). One cannot quickly replace a car or change logistics.
Long-run elasticity: higher (~0.5-0.7). It is possible to switch to fuel-efficient cars, develop public transport, change city planning.
Consequences:
- Short-term supply shocks—strong influence on prices
- Long-term high prices—decrease in consumption (peak oil demand)
- OPEC can control prices in the short run
For Investment Analysis
Questions for company analysis:
- How elastic is the demand for its products?
- Can the company pass cost increases on to consumers?
- How will demand change in a recession (YED)?
- What goods are substitutes and complements?
- How elastic is industry supply (barriers to entry)?
Red flags:
- High demand elasticity + low barriers = price pressure
- High YED + cyclical business = volatility
- Low PES in the industry + growing demand = windfall profits, but temporary
Elasticity is a lens through which one can analyze competitive dynamics, pricing, and the stability of a business model.
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