Whizzy super pop fun alternate economics day today:
The Guardian has a story about a possible national online marketplace. You can tell it's a government initiative as it begins with an "e-".
Also found an old BBC article by the proponent mentioned in the article above - Wingham Rowan on "Guaranteed Electronic Markets".
They also have something on Obi Obi creek in Australia, and its struggles against the march of Woolworths.