Find the indicated partial derivative. 
Definitions:
Equity Securities
Financial instruments that represent ownership interests in corporations, such as stocks.
Market Prices
The current price at which an asset or service can be bought or sold in a particular marketplace.
Formative Evaluation
An evaluative process conducted during the development of a program or project to improve its design and performance through ongoing feedback.
Measurement
The process of obtaining the size, quantity, or degree of something using standard units.
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