Natural numbers are all the counting numbers excluding zero and all negative numbers. People use these in everyday life to count, add, subtract, and even with money purposes
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Signed numbers are used for:TemperatureMoney, Accounting, or EconomyMath Problems
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There is no specific symbol. The symbol for real numbers is R and that for rational numbers is Q so you could use R \ Q.
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Economics is all about real life situations. All resources are limited and economics is simply about making decisions to use those resources efficiently.