Theory of imputation
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The imputation theory was important because it addressed the question of economic value. Marginalist economists such as Menger and Frank Fetter of the Austrian School maintained that value was not made up of the factors that made up a good; instead, it was made up of the most valuable use that the last unit of the good could be put to, the marginal utility of the finished good.
While it was easy to maintain that this was the value of goods consumed by the end user (lower-order goods), it was harder to make this case for higher-order goods that had no end user and merely went into the making of lower-order goods. In effect, higher-order goods do have end users, the manufacturers of lower-order goods. It was such people whose marginal utility decided the factor prices, and their products were valued on their marginal utility to the end users. Thus, the factors of production were as sensitive to marginal utility as consumer goods themselves.