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How do I get an outside line? apcalis sx side effects Normally, the marginal cost of production of a commodity acts as a floor to the commodity price. There are a number of reasons why this is not relevant to gold. Gold is unique. It is not consumed. Indeed, all the gold ever mined remains in existence today. In essence, this above-ground stock represents its supply. The World Gold Council estimates this stock at 175,000 tonnes.

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