有关price ceiling & price floor 的英文微观经济选择题

题目

有关price ceiling & price floor 的英文微观经济选择题
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Which of the following statements is true if the government places a price ceiling on petrol at €1.50 per litre and the equilibrium price is €1.00 per litre?
a.A significant increase in the demand for petrol could cause the price ceiling to become a binding constraint.
b.A significant increase in the supply of petrol could cause the price ceiling to become a binding constraint.
c.There will be a shortage of petrol.
d.There will be a surplus of petrol.
为什么选A?

答案

Equilibrium price is based on balance between demand and supply,so if demand is larger than supply,the price shall increase,somehow,to the price ceiling.