With regards to the złoty, the Germans continued to issue them but not with the intent of allowing or even accepting an independent Polish economy. German occupation policy was to pay its occupation troops with the currency of the state they were occupying. So German troops in France were paid in Francs, in Russia, rubles, and so on. This was to ease inflationary pressures on the Reichsmark and these currencies were pegged at artificially high rates in favor of the German currency. Thus German occupation troops often could buy the goods of occupied countries at a relatively cheaper price than at home.

This occupation policy is of a piece of Germany's plan for the Polish economy: a temporary exploitative policy that was a segue to even greater exploitation. German occupation was to be for the benefit of Germans. Major Polish businesses were expropriated by German firms. For example, German aviation firms carved up the industrial plant and property of the Polish PZL company. Under Generalplan Ost, the SS's plan for the Eastern territories, Polish farms were resettled with Volksdeutsche settlers with the idea of strengthening Germandom by forging a new agrarian order. These settlements would reflect a fusion of technological modernity, National Socialist ideology, and agrarian utopianism. In theory, this process was planned and had already begun in 1940/41. In practice, Germany's economic policy of occupied Poland was haphazard and prioritized short-term gains over any coherent implementation of its plans.

Sources

Aly, Götz. Hitler's Beneficiaries: Plunder, Racial War, and the Nazi Welfare State. New York: Metropolitan, 2007.

Chu, Winson. The German Minority in Interwar Poland. Cambridge: Cambridge University Press, 2012.