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Europe's central banks in quandary as Fed tightening nears

(Repeats story unchanged)

* ECB signals easing to combat low inflation, but how?

* UK, Swiss, Nordic central banks face different dilemmas

* After years of falling rates, toolbox in question

By Paul Taylor

BRUSSELS, Nov 25 (Reuters) - Europe's central banks are struggling with divergent quandaries over how to revive inflation and sustain economic growth as the U.S. Federal Reserve prepares to start raising interest rates for the first time since the collapse of Lehman Brothers.

The world's major economies are recovering at very varying paces from seven years of economic and financial crisis, with Japan tipping back into recession and China trying to surmount a severe wobble this year.

While the Fed is widely expected to pull the trigger on a slow but steady tightening from December in response to solid U.S. growth and employment figures, the European Central Bank is likely to ease monetary policy further on Dec. 3.

"It (the ECB) cannot run the risk of disappointing markets, having raised expectations of action," said Ken Wattret at BNP Paribas in London, reflecting the view of a big majority of economists polled by Reuters. {ID:nL9N0WZ01K]

That is because headline inflation remains close to zero in the 19-nation euro area, and core inflation stripped of energy prices and seasonal factors is barely 1 percent, just half the ECB's target of close to but below 2 percent.

Meanwhile, the Bank of England is still mulling when to make its first rate rise, and the Swiss and Swedish central banks are fretting over how to combat overvaluation of their currencies as the prospect of even lower ECB rates makes the euro cheap.

Central banks in the euro area, Switzerland, Denmark and Sweden have already taken the rate they offer banks on deposits below zero, with the non-euro countries having to go deeper into negative territory to steady their exchange rates.

The policy dilemmas differ, but they have a common thread: it's increasingly hard for central banks to rekindle inflation in economies suffering from a long-term reduction in growth potential due to low investment, high unemployment and ageing populations.

TOOLBOX IN QUESTION

ECB President Mario Draghi, who has signalled a likely easing for next week, strongly disputes suggestions that the central bank's toolbox is exhausted. But others question how effective monetary policy can be when rates are at or near the so-called zero lower bound.

"Globally, interest rates have been extraordinarily low for an exceptionally long time, in nominal and inflation-adjusted terms, against any benchmark," the Bank for International Settlements, the central bankers' central bank, said in July.