In Totnes, they've been using 'acorns' for a very long time, rather than money.

The 'acorns' come in a sort of cheque book.

"I hereby promise to clean your windows, if you promise to help mend my wall"

That kind of idea.

No money's ever needed amongst those who've joined that circle. Great idea!

No money. Let's burn it all and get back to bartering.