The Danish authorities were able to use their more cooperative stance to win important concessions for the country. They continually refused to enter a customs and currency union with Germany. Danes were concerned both about the negative economic effects of the German proposals, as well as the political ones. German officials did not want to risk their special relationship with Denmark by forcing an agreement on them, as they had done in other countries. The Danish government was also able to stall negotiations over the return of South Jutland to Germany, ban "closed-rank uniformed marches" that would have made nationalist German or Danish Nazi agitation more possible, keep National Socialists out of the government, and hold a relatively free election, with decidedly anti-Nazi results, in the middle of the war. Danish military officials also had access to sensitive German information, which they delivered to the Allies under government cover. The economic consequences of the occupation were also mitigated by German-Danish cooperation. Inflation rose sharply in the first year of the war, as the German Army spent a large amount of German military currency in Denmark, most importantly on military installations and troop deployments. Due to the Occupation, the National Bank of Denmark was compelled to exchange German currency for Danish notes, effectively granting the Germans a gigantic unsecured loan with only vague promises that the money would eventually be paid, something which never happened. The Danish government was later able to renegotiate the Germans' arbitrary exchange rate between the German military currency and the Danish krone to reduce this problem.