Fair exchange is no robbery
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What's the meaning of the phrase 'Fair exchange is no robbery'?
An exchange of two things of equal value is a reasonable and honest trade.
What's the origin of the phrase 'Fair exchange is no robbery'?
The proverbial saying 'fair exchange is no robbery' is first found in a place we might expect to find it, that is, an early and comprehensive collection of English proverbs. There are a few of such but, in this case, it is John Heywood's 1546 glossary A dialogue conteinyng the nomber in effect of all the prouerbes in the englishe tongue:
Though chaunge be no robbry for the changed case.
Apart from what it means and where it originated, there's not a great deal more to be said about this proverb.
See also: the List of Proverbs.