Economical factors:
Also, some economical factors should be taken into account in the argument.
First, we need to know how much did the price of ally increase after adjustment for inflation.(if the rate of inflation exceeds the increase in the price of the product, then the increase is reasonable.)
Second, the author fails to consider the variation in the demand for ... during the same period. If the supply of s short of demand, then there is good reason for the increased price of ... The soundness of the speaker’s claim is significantly weakened by the lack of above-mentioned economical consideration.