Simplify the following expression and express the final result using positive exponents only. 
For example, 
.
Definitions:
Exports Plus Imports
The total value of all goods and services a country sells to and buys from other countries; a measure of a country's international trade.
Comparative Advantage
The capability of a nation, person, corporation, or area to create a product or service at a reduced opportunity cost compared to its rivals.
Vast Resources
An abundance of natural, financial, or human resources available for use or development.
Specialization And Trade
A principle whereby individuals, firms, or countries produce a limited range of goods with higher efficiency and trade for other goods they are less efficient at producing.
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