首先你得说price floor 的定义
产生的surplus (excess supply)
consumer surplus和producer surplus的变动
This question was generally well answered by candidates with some effectively explained theory on the effect price floors (minimum prices) on markets where they are used. The strongest responses considered the impacts on consumers, producers and governments in terms of higher prices, increased revenues and the cost of intervention buying. An effective use of the minimum price diagram was important to illustrate the answer as was an effective real-world answer and many students used agricultural markets to do this.