Find a Cartesian equation for the curve described by the given polar equation. 
Definitions:
Inward Shift
A movement towards the origin of a supply or demand curve, indicating a decrease in supply or demand for a product.
Production Possibilities Curve
A graph representing the maximum combination of goods and services that can be produced with available resources and technology.
Emigration
The act of leaving one's own country to settle permanently in another.
Occupational Groups
Categories of jobs that involve similar tasks and require similar skills, training, education, or qualifications.
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