By David Dishman Business Writer ddishman@oklahoman.comAn analysis of increased Oklahoma tax collections following an agreement with Amazon.com could lend insight into how much the state stands to gain following a U.S. Supreme Court decision Thursday. Robert Dauffenbach, director of the Center for Economic and Management Research at the University of Oklahoma, showed what could be in store for Oklahoma after the Supreme Court ruled states could make laws for the collection of online sales taxes from internet retailers. Dauffenbach estimates Oklahoma could eventually expect to see $5.6 billion in online sales in the coming years.Read more on NewsOK.com