References
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http://www.businessdictionary.com/definition/guns-or-butter.html
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http://www.businessdictionary.com/definition/opportunity-cost.html
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http://www.businessdictionary.com/definition/marginal-cost.html
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place holder
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http://www.businessdictionary.com/definition/market-economy.html
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http://www.businessdictionary.com/definition/government-intervention.html
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http://www.investopedia.com/ask/answers/061515/what-are-some-historic-examples-hyperinflation.asp