Goldman Sachs throws support behind IEX exchange application

By John McCrank NEW YORK (Reuters) - Investment bank Goldman Sachs Group has thrown its support behind upstart trading venue IEX Group's bid to become a U.S. stock exchange, asking regulators to use the opportunity to address broader issues related to how the market is structured. IEX, the private trading venue featured in author Michael Lewis' book "Flash Boys: A Wall Street Revolt," applied in September with the U.S. Securities and Exchange Commission to become a registered stock exchange call