Evaluate the expression. 
Definitions:
Marginal Social Cost
The incremental cost borne by society due to the production of an extra unit of a good or service.
iTunes Download
A digital file, such as music or a movie, purchased and downloaded from Apple's iTunes platform.
Marginal Benefit
The increase in satisfaction or usefulness gained from the consumption of an additional unit of a good or service.
Marginal Cost
The expense associated with manufacturing an extra unit of a product or service.
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