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The study of economics basically comes down to supply and demand. When there is a lot of something, it tends to have a lower value than something that is rare. The most obvious example of something we all hold dear is Gold, whose total global supply would only fill an Olympic size swimming pool. Equally, if a lot of people need something, say food, then the price of a potato can sometimes exceed the value of a diamond earring, as it did after the war. As such,