Find the second derivative of the function. 
Definitions:
National Debt
The cumulative sum of money borrowed by a country's government through different channels.
National Debt
The total amount of money that a country's government has borrowed, by various means.
Budget Deficits
Occurs when a government spends more money than it receives in revenue over a specified period.
Billion
A numerical value represented by 1,000,000,000 or 10^9 in the international system.
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