Express 
in sigma notation with k = 5 as the lower limit.
Definitions:
Economy
The system of production, distribution, and consumption of goods and services in a particular geographic area.
Unemployment
The condition of being without a job, while actively searching for employment.
Production Possibilities Frontier
A curve depicting all maximum output possibilities for two or more goods given a set of inputs.
Resources
The total means available for economic and political development, such as minerals, labor force, and finances.
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