German commercial culture expects fair dealing from both customers and suppliers. Suppliers should not deceive or exploit customers. Customers should not abuse power or exploit suppliers. Neither party should extract maximum advantage through manipulation.
The principle of good faith (Treu und Glauben) applies bidirectionally. If you do business in Germany, operate fairly regardless of which role you play. Exploitation damages relationships and reputations. Fair dealing sustains relationships over time.
German commercial culture expects that both parties benefit reasonably from the relationship. Unfair behavior—from either side—violates expectations.
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