Vertaling van "since nothing would be worse than increasing rates again once " (Engels → Frans) :

It has finally awakened from its indifference; it should learn a lesson from the failure of its monetary policy, since nothing would be worse than increasing rates again once economic growth returns.
Elle sort, enfin, de son indifférence et devra tirer les leçons de l’échec de sa politique monétaire car rien ne serait pire que de ré-augmenter les taux lorsque la croissance économique reviendra.