FinanceUS FTC approves Chevron-Hess merger — with a catchJohn Hess cannot serve on Chevron board over FTC concerns about Opec communicationsChevron chief executive Mike Wirth (right) and Hess chief executive John Hess (ldeft) pitcured during an appearance on CNBC last year.Photo: REUTERS/SCANPIXRobert StewartNorth America Energy CorrespondentBaton Rouge