as a business owner, trying to keep track of 10k different currency and the relative value of them would be a logistical nightmare. Not only that but you basically would have to take the banks word that the intrinsic value (pegged to a standard like gold) is honest.
for example... lets say there are 3 differnt banks in my city alone...
all have there own currency. assuming there is no FDIC insurance... i would have to keep track of those 3 banks to be sure that those notes do not become worthless if the banks are about to go bankrupt. scale this out to 10k currency and now i have to track them all to be sure any one of those banks aren't on the verge of collapse leaving me holding the bag of worthless currency.
Tools of war are not always obvious. The worst weapon is an idea planted in the mind of man. Prejudices can kill, suspicion can destroy, and a thoughtless, frightened search for a scapegoat has an everlasting fallout all of its own.