弹性（Elasticity）是现代西方经济理论中用于微观分析的重要工程。19世纪中叶，英国经济学家穆勒在研究中注意到了需求与价格间的相互关系，由此产生了需求弹性的初步概念，本世纪初，另一位英国经济学家马歇尔将弹性明确地用公式表示出来，现在弹性在经济分析中已经得到广泛 Elasticity is an important project for microanalysis in modern western economic theory. In the mid-19th century, the British economist Mueller noticed the interrelationship between demand and price in his study, which gave rise to the initial concept of demand elasticity. By the turn of the century, another British economist, Marshall, would use elastic and definite The formula shows that flexibility is now widely available in economic analysis