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So there was this bicycle next to a park bench when I sat down. Someone came up and asked if I would take $100 for the bike........... ;-)
Ha, good one. As I made my post, I just KNEW someone was going to come on and offer that twist, of a situation where someone "selling something" or "granting approval" , was .... in actual reality, .... NOT the real owner, or real employee, etc...
My answer to that is, that, for starters, this question was not about those situations. Situations where the person was not the owner (and selling the London Bridge, etc..), or not a real employee (thus they had no authority to grant permission). The question was about "real employees" and "real owners".
This question was about legitimate cases of legitimate renters, employees, etc... So to jump from that, to cases where the premises changes, does not detract from my argument, it merely creates a new and
different scenario.
I suppose this too is probably a question for a lawyer, since I'm sure there's been cases of "good faith" or "reasonable assumption" court cases.
Your example is of an "imposter" who merely "poses" as the owner of the bike-for-sale. Well gee, taken to it's logical ends, so-too might I ask a cashier "can I use the restroom?". And the cashier says "ok, go ahead".
BUT WAIT, how do I
know that the cashier was *really* an employee? Afterall, I didn't ask to see his ID. And didn't give him a DNA test. It's certainly possible he might have been someone who stole an employees uniform, and was merely posing as a cashier.
Thus at some point, we all subconsciously make decisions, based on say-so of whomever we're asking. Assuming that they have the power to grant permission. Where does it end? I mean, you can keep thinking "this persons doesn't look authoritative enough", and work your way up to the president of the USA (afterall, you "can't be too safe", right?)