问题如下：
To eliminate the substitution bias in the calculation of consumer price index, the most appropriate method is to:
选项：
A.adopt the Hedonic pricing.
B.adopt a Paasche index method.
C.use Fisher index.
解释：
C is correct.
Hedonic pricing is a technique to adjust for product quality. The substitution bias can be adjusted by Fisher index, which is the geometric mean of the Laspeyres index and the Paasche index.
考点：Hedonic pricing
解析：Hedonic pricing是一种对产品质量进行调整的技术。替代偏差可以通过费雪指数进行调整，费雪指数是Laspeyres 和Paasche index的几何平均值。
老师，这个不是GDP的考点吧。。？
这道题现在被放在GDP的考点下面了。
