Anything goes. Trade what needs to be traded to get what you need. But don't burn your bridges. Let someone good at negotiating handle it.
I would like to use an alternative system of trading as suggested in Ecovillages: A Practical Guide to Sustainable Communities (Jan Martin Bang). My currency would be called something like 'favours' or 'Lovelock pounds'.
My husband and I recently joined the North London LETS trading scheme. LETS stands for "Local Exchange Trading Scheme" and it uses the process listed above. I was surprised to discover my other half is prepared to pay the same hourly rate for someone to explain existentialism to him as he would charge as an IT consultant. Just goes to show that one person's wasted degree is someone else's essential knowledge. I'm really looking forward to seeing how it works out.
Unexplored leads for this section:
LETS
Barter
Community-based economics