What Is Price Elasticity of Demand?

Price elasticity of demand is a crucial concept to understand in investing. It helps investors understand whether a company has pricing power or not.

Can it increase profits by raising prices, leading to increased profits? Or will the price increase lead to a drop in demand that ultimately hurts profits? A basic understanding of price elasticity will help you answer critical questions about the stock you are considering investing in.



It’s a simple equation to understand but tricky to sink in, so let’s embellish it with some examples. The price elasticity of demand is the percentage change in quantity demanded divided by the percentage change in price.

So, for instance, if Company A raises its product price by 10% and the demand falls by just 5%, its price elasticity of demand is 0.5. Alternatively, if Company B increases its product price by 10% and demand decreases by 10%, its price elasticity of demand is 1.

In this example, you could argue that Company A has more pricing power than Company B because demand for its product goes down less than for Company B. In this example, demand for Company A’s product is more inelastic than for Company B's product.

The following table shows these concepts. Working through the table, perfect price inelasticity is when demand for a product won’t change when the price moves; an example includes a life-saving pharmaceutical. If the drug will save a life, then most people will demand it regardless of a change in the price.

Perfect price elasticity is when demand moves infinitely given a price change, with an example being two producers of a commodity selling them side by side. If there are two producers of identical bananas selling them side by side in a supermarket at the same price, and one of them changes the price, then the lower-priced seller will get all the demand while the higher-priced seller will get none.

Unitary elastic demand occurs when a change in price results in a corresponding change in demand.

It’s important to note that perfect inelasticity and perfect elasticity are polar conditions used to explain a concept. In the real world, all products are somewhere between having a price elasticity of demand of zero and infinity.



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