I'm pretty sure I can't take total credit for this startling discovery. It flowered in discussions here and at Bad Tux's place. If he didn't have a visible hand in creating this notion, he at least encouraged and nurtured it in not-too-subtle ways.
I will, however, stake claim to the idea that the visible manifestation of the FREE MARKET FAIRY is an image of Milton Friedman in drag.
Full credit to BT for actually locating his (her?, its?) picture.