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Continue to ChatWhen goods are exchanged between countries, they must be paid for by commodities or gold. They cannot be paid for by the notes, certificates, and checks of the purchaser's country, since these are of value only in the country of issue. - Carroll Quigley from https://whatsmyquote.com/quote/when-goods-are-exchanged-between-countries-they-must-be-paid-for-by-commodities-or-gold-they-cannot-be-paid