I'm not so sure about the effectiveness of this. Just double? It's a great idea but I'd suggest that you encourage participants to at least start there and to pay what they can afford. Wal-Mart employees could certainly use the extra wages!

My second concern is how do we know that they'll use this money in a way that is good for social justice? I'd be more confident if unions got their cut I suppose.

I don't mean to be a pessimistic - I do appreciate your outside the box thinking.