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{{defn|A contract that agrees to pay one unit of a numeraire (a currency or a commodity) if a particular state occurs at a particular time in the fu ...the method of exchange in times of [[monetary crisis]], such as when {{gli|currency}} becomes unstable (e.g. by {{gli|hyperinflation}} or a {{gli|deflationary ...

...004; A. Hingston Quiggin, ''A survey of primitive money; the beginnings of currency''. London: Methuen & Co., 1949; Paul Einzig, ''Primitive money in its ethno ...uto">A. Hingston Quiggin, ''A survey of primitive money; the beginnings of currency''. London: Methuen & Co., 1949. Paul Einzig, ''Primitive money in its ethno ...

! data-sort-type=currency | Annual value '''(billions of USD)''' ...ge of the [[California Agricultural Labor Relations Act of 1975]], by 2012 unions were less popular with farmworkers than they had been before it was passed. ...