Find the gradient vector field of 
Definitions:
Sunk Cost
An expense that has been paid and cannot be retrieved.
Expected Cost
An estimate of the cost for a product, project, or operation that is anticipated under normal conditions.
Sell
The act of giving or handing over something in exchange for money.
Contribution Margin
The difference between sales revenue and variable costs, indicating how much revenue contributes to covering fixed costs and generating profit.
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