Nigel Gault, chief U.S. economist at IHS Global Insight, discusses the Institute for Supply Management’s June non-manufacturing index released today.   The ISM's index for non-manufacturing businesses decreased to 53.3, less than projected, from 54.6 in May. Economists forecast the gauge would drop to 53.7, according to the median estimate in a Bloomberg News survey. Gault speaks on Bloomberg Television's "InBusiness With Margaret Brennan."