【化】 需求弹性
【经】 需要弹性

coefficient of cubical elasticity value of elasticity bulk modulus of elasticity relaxed modulus of elasticity unrelaxed modulus of elasticity ellipse of elasticity modulus of elasticity of wood demand of elasticity weakness of demand lack of demand principle of effective demand arc elasticity of demand price elasticity of demand unitary elasticity of demand cross-elasticity of demand income elasticity of demand point elasticity of demand law of elasticity of demand coefficient of pirce elasticity of demand coefficient of income elasticity of demand demand elasticity price elasticity of demand for import