"It is estimated that the Sicilian Mafia costs the Sicilian economy more than 10 billion a year through protection rackets. Roughly 80% of Sicilian businesses pay protection money to Cosa Nostra. Monthly payments can range from 200 for a small shop or bar to 5,000 for a supermarket. Targets who refuse to buy protection are usually harassed, often through property damage; physical assault is rare."
Gambetta, The Sicilian Mafia p.54-172