TPG2022 Chapter II paragraph 2.30

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In a market economy, the compensation for performing similar functions would tend to be equalized across different activities. In contrast, prices for different products would tend to equalize only to the extent that those products were substitutes for one another. Because gross profit margins represent gross compensation, after the cost of sales for specific functions performed (taking into account assets used and risks assumed), product differences are less significant. For example, the facts may indicate that a distribution company performs the same functions (taking into account assets used and risks assumed) selling toasters as it would selling blenders, and hence in a market economy there should be a similar level of compensation for the two activities. However, consumers would not consider toasters and blenders to be particularly close substitutes, and hence there would be no reason to expect their prices to be the same.