Note that the calculated price elasticity of demand is always a [ positive / negative] number, because P and Qd are negatively related (by the law of demand). For ease of communication (to avoid confusion), it's customary to drop the minus sign so having a price elasticity of demand of 4 (now written as 4) is said to be [ greater / smaller] than price elasticity of 1.5 (now written as 1.5)