TOKYO, May 21 (Reuters) - The euro's weakness benefits Europe's exports, Eurogroup Chairman Jean-Claude Juncker was quoted as saying by the Nikkei newspaper, after the euro fell this week to a four-year low against the dollar.
Juncker was also quoted as saying in the interview that European authorities have vigorously acted against speculative moves.
The interview took place on Thursday, the Nikkei said.
Investors have punished the euro, European stocks and government debt recently after Greece revealed that its debt burden was larger than previously reported, stoking fears that European countries with weak public finances might be unable to repay their debt.
On proposed new bank taxes to help pay for financial bailouts, Juncker said he would not rule out Europe acting unilaterally to apply such a levy.
While major countries are divided on bank taxes, supporters such as Britain have argued a levy must be internationally coordinated otherwise banks will find ways round it. (Reporting by Rie Ishiguro; Editing by Edwina Gibbs)