WASHINGTON, March 29 (Reuters) - Underlying inflation in the euro zone is proving sticky and the recent fall in energy costs may not pull it down as fast as some expect, European Central Bank board member Isabel Schnabel said on Wednesday, highlighting the bank's chief concern.
Overall inflation in the 20 nations sharing the euro currency is falling quickly but core prices, which exclude volatile fuel and food costs, is still rising, suggesting rapid price growth could prove durable and difficult to break.
Schnabel, head of the ECB's market operations, said last year's energy price spike seeped into the broader economy quickly but the reversal may take longer.
Schnabel said the ECB has some flexibility in reaching its 2% target and did not want to create needless pain by acting too quickly.
Conservative policymakers have said underlying inflation is now increasingly driven by domestic factors, particularly more expensive services, and they are wary of wage growth, which at 5-6% lags inflation but remains inconsistent with the ECB's 2% inflation target.