Lanham, MD: Rowman Littlefield. As the market was experiencing a glut and prices for petroleum were low, in 1933 the Nazi government made a profit-sharing agreement with IG Farben, guaranteeing them a 5 percent return on capital invested in their synthetic oil plant at Leuna. The German Luftwaffe failed to defeat the RAF in what became known as the Battle of Britain, and by the end of October, Hitler realised that air superiority would not be achieved. The Nazi regime dominated neighbours through military threats in the years leading up to war. In Poland, Nazi plunder of raw materials began even before the German invasion had concluded. The law was only loosely enforced, and in spite of a ban on vivisection, the Ministry of the Interior readily handed out permits for experiments on animals. The change was never fully implemented, as the Länder were still used as administrative divisions for some government departments such as education. Following a month-long series of attacks by members of the SA on Jewish businesses and synagogues, on itler declared a national boycott of Jewish businesses. "Statistisches Jahrbuch für die Bundesrepublik Deutschland" (PDF) (in German). Weale, Adrian (2012) 2010.