Gambling industry officials say U.S. casinos had a $240 billion economic impact and employed 1.7 million people in 2013. The American Gaming Association announced the results of its economic study Tuesday at a news conference. The group's annual G2E Global Gaming Expo kicks off this week at the Sands Expo and Convention Center in Las Vegas. Oxford Economics studied the industry's impact and included spending and revenue that might be linked but not directly connected to a casino. An example is a traveler who visits an area for a casino but also spends at a nearby gas station. TheStreet's Ruben Ramirez reports from New York.