If cards replace currency in general, no one will circulate cards that say "I'm prepared to maintain the sewerage system for this town, indefinitely"
When there are more mentally retarded paraplegics than there are charitable
nurses, diabled people will have to fall back on cash, if they can.
CashTrumpsCards.
among the people prepared to shovel a little crap. We can easily choose to
make it disadvantageous to avoid doing your share, in which case human-nature
will favour crap-shoveling over slacking.