Unit 1: Revision: Price elasticity of demand

From economics student come these useful summaries of PED, its uses and its limitations

http://rapidrevision.co.uk/economics-student/2009/04/17/elasticity-of-demand-and-those-minus-signs/

http://rapidrevision.co.uk/economics-student/2009/04/18/business-uses-of-price-elasticity/

http://rapidrevision.co.uk/economics-student/2009/04/19/estimating-and-relying-on-elasticity/