By Axel Threlfall and Paul Taylor
DAVOS, Switzerland (Reuters) - Central banks are coming under too much pressure from politicians to act to promote growth and weaken currencies, the head of the world's central banking forum said on Thursday.
Jaime Caruana, general manager of the Bank for International Settlements, also said in a Reuters Insider television interview that the world was reaching the point where the damage from central banks' printing money could outweigh the benefits.
Asked about pressure from the new Tokyo government on the Bank of Japan to increase asset purchases to drag the economy out of its fourth recession since 2000 and end deflation, he said authorities should focus more on their own actions.
"There is always a risk of overburdening central banks. There is perhaps excessive pressure when we discuss about growth; probably the attention should be focusing on productivity, competitiveness, labour market participation. There is a bit too much focus on central banks," Caruana said.
Central bank measures such as cutting interest rates could only buy time for governments to take action on structural economic reform, but "sometimes low rates provide incentives that time is not used so wisely", he said.
Asked whether he was concerned about action by central banks to weaken currencies and the risk of competitive devaluations, Caruana said authorities needed to explain clearly the rationale behind their actions.
"If this is the case, probably some of the anxieties about currency wars will be minimised. The central banks are taking a lot of actions, but I don't think that behind that is this rationale," he said.
The BIS chief said quantitative easing policies by some central banks including the U.S. Federal Reserve and the Bank of England were starting to show undesirable effects such as the mispricing of risk.
"As time goes on, the balance of the benefits that we get with low interest rates and a lot of liquidity and these interventions and the costs, is going to higher costs and less efficiency on the side of the benefits," he said.
Asked whether he saw the risk of new asset price bubbles, Caruana said: "We need to pay attention to the misvaluation of risks, the misassessment of risk. I think we need to monitor that."
He pointed to high-yield segments of the markets as one area where bubbles were starting to appear.
(Writing by Paul Taylor; Editing by Will Waterman)