LONDON, Feb 27 (Reuters) - Central banks need to "get the job done" when it comes to getting inflation back under control, the Bank for International Settlements has said, urging them to avoid the mistakes of the 1970's by declaring victory too early. The BIS, dubbed the bank for central banks, said it was vital authorities didn't repeat the stop-start cycles of the 1970s when interest rates had to be hiked to painfully high levels after attempts to lower them resulted in an inflation surge. "Central banks have been very, very clear that at this stage the most important aspect is to get the job done," the head of the BIS' Monetary and Economic Department, Claudio Borio, said as part of a quarterly report. The BIS' report also included research showing that rate rises are more likely to cause financial system stress when private debt levels are high, although tougher "prudential policies" can reduce the risk and give central banks more room for manoeuvre. Another section looks at how higher commodity prices and the U.S. dollar exchange rate significantly affects the risk of stagflation - weak growth and high inflation - especially in developing market economies.

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