Olli Rehn, Governor of the Bank of Finland and member of the European Central Bank (ECB) Governing Council, has expressed concern that inflation in the euro zone may remain persistently below the ECB's 2% target for an extended period. Rehn warned that such a prolonged undershoot could shift the inflation expectations of euro-zone consumers, potentially affecting the overall price outlook. He emphasized the importance of the ECB being mindful of this risk to prevent a downward shift in inflation expectations, which could complicate the ECB's monetary policy objectives.