In the debate over whether to erect a wall between investment and commercial banking, a lot of questions on the effects and side-effects remain unanswered, Bundesbank executive member Andreas Dombret argued yesterday in Frankfurt.

"It seems unclear to me whether breaking up the banks would take us all the way to financial stability. It could make banks somewhat easier to resolve – that much is clear. But there are three crucial points on which I have doubts," Dombret said.

He continued: "I doubt