 Peter Liberman wrote in 1996 that the French view, "that Germany could pay and only lacked the requisite will", has "gained support from recent historical research".On the other hand, Charles Feinstein criticised Mantoux's argument that the Allies could have collected reparations as the German economy grew and for pointing out the reluctance of the Germans to pay more taxes when they already saw reparations as oppressive and unjust.Feinstein concluded, "The payments were a paramount cause of instability and a barrier to international economic co-operation."