“But the Roman emperors soon discovered an ingenious device. They proceeded to call in the coins of the realm, ostensibly for repairs. Then, by various means, such as filing off small parts of the coins, or introducing cheaper alloys, they reduced the silver content of the money without changing its original face value. This devalution enabled them to add many more silver coins to the Roman money supply. The practice was started by Nero, and accelerated by his successors. By Diocletian’s time, the denarius (standard silver coin) had been reduced to one-tenth of its former value.
The result was a steep rise in prices throughout the vast Roman empire. As has happened throughout history, the public indignantly accused merchants and speculators of causing the rise in prices. It was generally agreed that the only remedy was stringent maximum price controls by the government.”