Because it allows banks to lend out money they don't have and when the banks lobby hard enough to completely remove whats left of the gold standard, the sky's the limit for lending out money. Creating money out of thin air increases inflation. However, in a weird way it impoverishes the lower classes while inriching the elite class because the latter tends to better connected and therefor closer to the "monetary spigot". This allows the elite class to buy up everything(land, companies, lobby/bribe governments)from the top down like a game of pacman.