exchange of commodities

See: commerce, trade
References in classic literature ?
Somebody has said it's a fine thing to make two ears of corn grow where only one grew before; but, sir, it's a fine thing, too, to further the exchange of commodities, and bring the grains of corn to the mouths that are hungry.
What happens, though, when an artist participates directly in the creation of market value and enters into the exchange of commodities through his or her own works?

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