Find the differential of the function 
Definitions:
External
Pertaining to or located outside of an entity or organization, often relating to the external environment, influences, or factors.
Common
Pertains to something that is usual, shared by multiple entities, or occurring frequently.
Positive Externality
A benefit that affects someone who did not choose to incur that benefit, often related to economic activities.
Nominal
pertaining to names or terms, or representing values by names in certain contexts, such as nominal data in statistics which categorizes without a natural order.
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