Fair exchange is no robbery
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.