Supply, Demand and Government Policies供给、需求与政府政策Chapter 6Supply, Demand, and Government Policiesu In a free, unregulated market system, market forces establish equilibrium prices and exchange quantities.u While equilibrium conditions may be efficient, it may be true that not everyone is satisfied. u One of the roles of economists is to use their theories to assist in the development of policies.供给、需求与政府政策u 在一个自由、无管制的市场系统中，市场力量实现均衡价格和均衡交易量。u 这种均衡结果也许是有效的，但并不是每个人对此都感到满意。 u 经济学家的作用之一就是利用他们的理论帮助制定政策
