As Fred* will confirm, I've always been a fan of Sesame Street.
Excuse me while I remove a fly that's crawling on Jo Whiley's face...
Okay, that's better. Now where was I?
Oh, right - Sesame Street. Every now and again, a guy in a trenchcoat and hat would try and sell Ernie things for a nickel, like an empty box, or air, etc., with varying degrees of success.
His name is Lefty the Salesman, and one has to admire his dedication - might even give Mr. CMOT Dibbler a run for his money.
Some of his initial forays into the field of supply/demand were not altogether successful, to wit:
However, Lefty was nothing if not a trier, and although his initial attempts at independence were less than wholly successful:
Lefty nonetheless persisted, refining his salesmanship skills with various ideas, up to and including this - one of his finest moments, if (spoiler alert) sadly unsuccessful:
I'dve bought it, wouldn't you?
*Our regular reader