To fuel the welfare state, money is vital and therefore transactions involving others enable taxes to be collected at little cost. As the consumer economy falters, based upon unsustainable credit creation that has ceased and now sucks the life from the economy, we must become familiar with barter and greater time with less cash/money/credit!
Food vouchers do not require money, except that those who retail it must have that to buy from the wholesaler.
Swap meets and growing own food and mending and making do will again be popular. The alternatives are not pretty, as prisons will be shut down even in America the home of the locked up slave!