SJP, perhaps I should clarify that by the term currency trader I was not using it in the limited sense of full-time professional specialized currency traders who make a living buying and selling money, but rather anyone who provides the service of converting money, be it the post office selling a foreign-currency money-order, the bank selling a foreign bank draft, the automatic teller in the US giving you US dollars though your bank card only has Canadian dollars, etc. etc. etc. All of these services can qualify as currency trading, even if currency trading may be a side business or just a part of the business in most cases.
OK, in that case I agree with you. There certainly was currency conversion carried out in the gold standard days. However, such a conversion was along strictly defined lines. The conversion rate was fixed, and the only trading took place in the sense that some commission was charged for handling the transaction.
The transaction fee would be fixed, probably posted somewhere. If somebody wants to buy a book in Germany with Canadian dollar say six months in future, he would know exactly how much it would cost (barring the highly unlikely event of Canada or Germany officially devaluing their currency).
There was plenty of stability, a far cry from the no holds barred currency trading today. Even if we accept your definition, currency trading was minimal in those days. And even there, the traders did not charge what the market would bear, their charges did not vary from minute to minute, day to day, as the exchange rates today do.
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