Wednesday, January 23, 2013

Supply & Demand | Short-Run / Long-Run Price Elasticity of Demand



In July 2008, average prices for household energy were 18% higher than in July 2007. Fuel oil and other fuels prices were up 61%, while natural gas and electricity prices were up 18%, according to the U.S. Bureau of Labor Statistics. How is the short-run price elasticity of demand likely to differ from the long-run price elasticity of demand for household energy products?





















Your Answer:
For most products, long-run demand is more elastic than short-run demand, and the demand for household energy products is no different. 

For the winter of 2008, many consumers will pay higher prices for fuel oil, but will likely consume a slightly lower quantity: Demand will be inelastic in the short run. 

As time passes, however, many households will install more energy efficient windows and insulation to minimize heat loss in the winter. Some households will switch to using electric space heaters or electric heating systems as electricity prices rise more slowly than home heating oil prices. Some householders will move to smaller homes to reduce home heating needs over time as well. 

In the long run, the percentage change in quantity of home energy demanded in response to price will be much larger: Demand will become much more price elastic.

Source: Pindyck / Rubinfeld, Microeconomics, 7th edition, Pearson


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