LONDON (MarketWatch) -- The People's Bank of China will boost the yuan reserve requirement ratio for banks by 50 basis points, or half a percentage point, effective Jan. 18, the bank said in a statement on its Web site Tuesday. The ratio refers to the proportion of deposits banks are required to hold at the central bank. http://www.marketwatch.com/story/pboc-raises-yuan-reserve-requirement-ratio-2010-01-12