Law, economics and Business Administration are somewhat related fields. Lawyers study law and economics as economics major focus is on real life effects of the law that involves adverse effects like rent control, protection of weak parties etc. On the other hand, economists study law to allow them to model real life situations. Thus, if you wish to have a career in these related fields, you can switch to studying in top German universities to acquire proper knowledge and skills in these fields.
The core areas of expertise that are offered by German universities are:-