FILE PHOTO: Deutsche Bank's Supervisory Board Chairman Paul Achleitner addresses the audience during the bank's annual meeting in Frankfurt, Germany, May 24, 2018. REUTERS/Kai Pfaffenbach

VADUZ, Liechtenstein (Reuters) - Deutsche Bank’s challenge may be that it is too small to reap the benefits of scale, the lender’s supervisory board chairman said on Wednesday, a week after the bank announced merger talks with rival Commerzbank.

“Our problem may not be too big to fail, but rather too small to scale,” chairman Paul Achleitner said. “Size matters.”