Find the unit normal vector at the given point. 
Definitions:
Price Ceiling
A legal maximum price that can be charged for a good or service, typically set by government regulation.
Shortage
A situation where the demand for a good or service exceeds the supply available at a specific price.
Rent Controls
Government-imposed limits on the amount landlords can charge tenants for leasing property.
Rental Units
Housing units that are available for rent, including apartments, houses, and townhouses.
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