Daniel Bouton, chairman of Société Générale, became the latest leading bank executive to suggest signs of improvement in the financial markets while calling on policymakers to learn the lessons of the crisis.

Mr Bouton – whose own bank suffered a €2.6bn ($4.1bn) writedown on subprime loans on top of a €4.9bn alleged rogue trading fraud earlier this year – told French parliamentarians in Paris there was no credit crunch in France