Show that the function 
has no relative extrema on 
.
Definitions:
Gross Domestic Product
The monetary value of all finished goods and services made within a country during a specific period.
Interest Rate
The percentage charged on a loan or paid on savings over a certain period of time, reflecting the cost of borrowing or the return on savings.
Investment
An asset or item acquired with the goal of generating income or appreciation in value.
Financial Securities
Financial instruments representing some type of financial value, including stocks, bonds, and options, which can be bought and sold in financial markets.
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