Find a unit normal vector to the surface 
at the point 
.
Definitions:
Product Demand
The total amount of a product or service that consumers are willing and able to purchase at a given price level.
Labor Demand
The quantity of labor that employers are willing to hire at a given wage rate.
Work Rules
Formal regulations or policies dictating the conditions and behaviors allowed in a workplace.
Demand Curve
An illustrative chart that depicts how the demand for a product varies with its price.
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