Usury
Exploitation through a striking disparity.
Usury is a special case of immorality: someone exploits a predicament, inexperience, or weakness and has performances promised to them that are in striking disparity, such as usurious interest or usurious rent. Such contracts are void.
The relevant statutes
§ 138 BGB
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Related terms
General explanation for self-help, not legal advice (RDG). Individual cases may differ: if in doubt, contact a consumer advice center or a lawyer.