Dictatorships tend to fall the way Ernest Hemingway said people go bankrupt: gradually, then suddenly. The omens can be obvious with hindsight. In 1978 Iran’s corrupt, brutal, unpopular regime was besieged by protesters and led by a sick old shah. The next year it was swept away.

Today Iranian protesters are again calling for the overthrow of a corrupt, brutal regime; this time led by a sick old ayatollah, Ali Khamenei. As Ray Takeyh, a veteran Iran-watcher, put it, “History…is surely rhyming on the streets of Tehran.”

Read more from The Economist