Which type of conduct by a merchant is considered inherently unreasonable?

The conduct that is considered inherently unreasonable in this context is gratuitous injury to a customer. This reflects a fundamental principle of tort law, which mandates that individuals and entities must act reasonably to avoid causing harm to others. When a merchant's actions result in injury, especially when it is not justifiable or necessary within the scope of their duties, it demonstrates a blatant disregard for the safety and well-being of their customers. This type of conduct does not align with the expected standard of care that merchants must uphold, making it inherently unreasonable.

In contrast, detaining someone publicly for theft could be considered reasonable under certain circumstances, as it relates to protecting property and preventing crime, provided it adheres to legal standards. Providing customers with a safe environment is not only a reasonable expectation of merchants but also a legal obligation to ensure their premises are safe for patrons. Similarly, warning customers about potential hazards is a part of a merchant's duty to keep patrons informed and safe, thereby acting in a responsible manner.