NO.PZ2017100901000001
问题如下：
If the price elasticity coefficient of the demand curve for paper clips is equal to
–1, demand is:
选项：
A.elastic.
B.inelastic.
C.unit elastic.
解释：
C is correct.
When the price elasticity of demand coefficient is –1, demand is said to be unit elastic, or unitary elastic.
考点：unit elastic
解析：完全弹性是指商品的自由价格弹性数值为-1，所以C选项正确。
题目是“the price elasticity coefficient。。。equals -1"，这个-1指的是coefficient不是么？
