#monetary_standard__standard  the value behind the money in a monetary system
  supertype:  #value  the quality (positive or negative) that renders something desirable or valuable; "the Shakespearean Shylock is of dubious value in the modern world"
  subtype:  #gold_standard  a monetary standard under which the basic unit of currency is defined by a stated quantity of gold
  subtype:  #silver_standard  a monetary standard under which the basic unit of currency is defined by a stated quantity of silver
  subtype:  #bimetallism  a monetary standard under which the basic unit of currency is defined by stated amounts of two metals (usually gold and silver) with values set at a predetermined ratio

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