Simplify the expression.(Assume that r, s, and t are positive.) 
Definitions:
Adam Smith
An 18th-century Scottish economist and philosopher known as the father of modern economics and author of "The Wealth of Nations."
Opportunity Cost
The cost of forgoing the next best alternative when making a decision, representing the benefits one could have received by taking the alternative action.
Forgone Interest
The potential interest earnings lost by choosing one investment over another or by keeping money in a non-interest-bearing account.
Economic Growth
The increase in the amount of goods and services produced by an economy over time, typically measured as the percent rate of increase in real gross domestic product (GDP).
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