I've got a very weak signal quality meds delivery Former member of the board of governors of the Federal Reserve System, Professor Randy Kroszner, tells the BBC's Nkem Ifejika that Janet Yellen is "battle tested" and that she will be driven by the data in deciding when to reduce support to the markets. On the US budget crisis he adds: "There isn't as much adult supervision in Washington as anyone in the world would like", but the process does help prevent the US getting into as bad a debt situation as Greece.