This interactive slide show introduces the student to the concepts of price elasticity of demand, the total revenue test, and cross price elasticity of demand. I have included slides that cover the math for calculating both types of elasticity of demand, as well as the total revenue test. Students will also be introduced to the midpoint/arc method of calculating the price elasticity of demand, and I have included a link to a Mr. Clifford video on elasticity of demand (great for a final review).