&gt;derivatives contracts<p>This is the cause.<p>It is not mere speculation, like it is with commodities trading, it is &quot;trading&quot; of imaginary things with other people&#x27;s money in a way that it will be other people&#x27;s problems. Now there is no way to convert these imaginary things back to other people&#x27;s money, so it became German people&#x27;s problem.