[phrenic]

So none of the 50,000 people at the Stones' show spent any money that day outside of the fence around the commons?

It's not just direct spending either. Even local distributors who supplied the concert with random things like pepsi, coke, beer, hot dogs, hot dog buns, tents, etc all benefited.

Yes there is a good some of money that always filters its ways out of the local economy, but thats no different than any show, anywhere, ever.