I'd suppose the maxis would argue that services would spring up to take a small fee, post the collateral, negotiate fair resolution to disputes, etc ... but the

I'd suppose the maxis would argue that services would spring up to take a small fee, post the collateral, negotiate fair resolution to disputes, etc ... but then they're halfway to reinventing rental agencies, insurance and credit cards and all that with sprinkling of operational and exchange rate risk thrown on top.