BRIEF-Citigroup says Fraser to head CitiMortgage
May 20 (Reuters) - Citigroup Inc : * CEO Corbat says Jane Fraser, CEO of private bank, to become CEO of
CitiMortgage-memo * CEO Corbat says Francesco Vanni D'archirafi, former head of transaction
services business, will become the new CEO of Citi Holdings-memo
DAVOS, Switzerland - Central banks have done their best to rescue the world economy by printing money and politicians must now act fast to enact structural reforms and pro-investment policies to boost growth, central bankers said on Saturday.