NSSF boosting use of fund firms

China’s $200 billion National Social Security Fund is tipped to make greater use of external asset managers and boost foreign exposure as it wins more portfolio mandates from provincial governments. It has also been criticised by the country's National Audit Office for its approach to index investing. The proportion of NSSF assets managed by external managers rose to 46% last year from 41% in 2012, according to its annual report, released on Monday. This was flagged as a trend las…