Story summary.A couple of human conmen running their "Gigantic Medicine Show" have landed on Saturn, attracting curious Saturnians to crowd around their ship. So they open shop - selling "The Red Mans' Old-Fashioned Radioactive Herb Remedy, fortified with vitamins A to R inclusive, the latter made with the most recently discovered carbon isotope", with the promise it will "increase your intelligence a thousandfold!" But payment should be in the form of red bead necklaces Saturnians wear - dirt cheap there, very pricey on earth.
Well, both sides will successfully trade what they desire ... to the horror of the sellers...
Fact sheet.First published: Thrilling Wonder Stories, February 1941.
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Related: Stories of William Morrison.