There's a reason we moved away from the barter system. Cash would still be useful if it was rare and accepted by the government, though you should expect massive inflation. But something like gold would probably be a good contender as a new money.
Yes, the barter system damages any liquidity. You have to cease thinking in terms of any standard of value. Everything is this-for-that. Very hard to do on a large scale. I think the very concept of money would have to collapse.
