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世界上的万事万物总是此起彼伏、彼消此长。用经济学的话说,这叫从一种均衡状态过渡到另一种均衡状态。用中国的俗话说,这叫“按下葫芦浮起瓢”。所以,现实生活中真正值得研究的问题往往是:什么样的约束条件导致了什么状态下的均衡?换成俗话说就是:什么情况下按下了“这个葫芦”,却浮起了“那个瓢”?按下了“这个葫芦”超载超限运输不仅使国家花巨资修建的高等级公路短短几年就破烂不堪,而且造成大量的交通事故。据交通部公路司张剑飞司长介绍:我国每年要在道路修复上
Everything in the world is always one after another. In economics, this is called a transition from one equilibrium to another. With Chinese saying goes, this is called “press the gourd floating scoop.” Therefore, what really deserves to be studied in real life is often the question: what kind of constraints lead to an equilibrium under what conditions? As the saying goes: Under what circumstances has the “gourd” been pressed, but “the scoop Press the ”gourd" overloaded transport overload not only the state spent heavily on the construction of high-grade road just a few years junk, but also caused a large number of traffic accidents. According to Director of Jian-Fei Zhang, Division of Highway, Ministry of Communications, China introduced the road to be repaired every year