Stay in school, kids— it may help you become a better gangster. The University of Essex recently analyzed U.S. Census data and information from the Federal Bureau of Narcotics to determine whether there was a correlation between college and income of American gangsters. Turns out, for each additional year of higher learning Italian-American gangsters did, they saw an increase of 8.5% in income. Guess college really does pay off, even for mobsters. The wealthiest of them all though? Colombian drug lord Pablo Escobar, with a net worth of $9 billion. Escobar didn’t even finish college; perhaps, his profession valued street smarts over academic knowledge. Two of the five on the list made their money doing real estate deals.