NEW YORK (MarketWatch) -- Former Federal Reserve Chairman Paul Volcker on Thursday defended President Barack Obama's proposed tax on large financial institutions, saying the White House was offering "a reasonable response to ...http://www.marketwatch.com/story/volcker-white-house-bank-tax-idea-is-reasonableNEW YORK, Jan 14 (Reuters) - The US central bank must have a "strong voice and authority" on regulatory matters, Paul Volcker, an economic adviser to President Barack Obama, sai...