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The Austrian branch of Habsburg monarchs needed the economic power of Hungary for the Ottoman wars. During the Ottoman wars the territory of the former Kingdom of Hungary shrunk by around 70%. Despite these enormous territorial and demographic losses, the smaller, heavily war-torn Royal Hungary had remained economically more important than Austria or Kingdom of Bohemia even at the end of the 16th century.[8] Out of all his countries, the depleted Kingdom of Hungary was, at that time, Ferdinand’s largest source of revenue.[9]
Dr. István Kenyeres: The Financial Administrative Reforms and Revenues of Ferdinand I in Hungary, English summary at page 92 Link1: https://archive.org/details/061092Kenyeres1