In this first lesson on elasticities we'll learn the definition, formula and interpretations of the price elasticity of demand (PED) coefficient. Want to learn more about economics, or just be ready for an upcoming quiz, test or end of year exam? Jason Welker is available for tutoring, IB internal assessment and extended essay support, and other services to support economics students and teachers. Learn more here! http://econclassroom.com/?page_id=5870