Other
Price Elasticity of Demand
This site gives easy to understand definitions of price elasticity, along with examples, formulas, and factors determining elasticity.
Other
Economics of Health Care: Price Elasticity of Demand
This site provides a thorough analysis of the concept of elasticity, and uses an example in the health care industry.
Robert Schenk, PhD
Price Elasticity
This site offers a good description of price elasticity of demand for a good, and gives examples of which kinds of goods may be elastic or inelastic.
Khan Academy
Khan Academy: Elasticity and Tax Revenue
Read about how elasticity affects tax revenue. This resource is designed for students who are taking a college-level microeconomics course.