Fisher’s index number was developed by Prof. Fisher who used more than 100 formula for finding best for formula for index number. In the end, he calculated index number by using the geometric mean of laspeyres index number and paasche’s index number. Geometric mean is the best option for calculating index number. Except this, in this formula, we use both base year and current year base, so it is bias-less. It also satisfied the time reversal test and factor reversal test.
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