I wouldn't want to live my life knowing that I'm trying to pull everyone and everything over the table and that i make others miserable wherever I go.
If you want to find a business reason: long term relationships and trust both are valuable and build future business and new connections. But, really, the first reason should be enough.
Going in weapons hot is really dangerous for everyone involved and much like lawyers with law, the smartest people will seek to minimize their exposure to risk (ie. courtrooms, raids, etc.)
A better and cheaper solution in a hostage negotiation is to figure out the core motives for the hostage takers (often money [and why they need it]) and lead them to realistic expectations and a feeling of fairness.
It’s not that you shouldn’t exploit them (though in most cases it’s grately beneficial to both parties if you don’t), it’s that if you’re doing it right, you don’t need to in most cases.
There’s always exceptions, but the concept of approaching any deal with a core principle of exploiting the other party is a flawed strategy.
Maybe a society full of sociopaths can get along just fine, but I'd rather not run that experiment.
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If a business uses your skills to make a profit are you being exploited?
Does it make a difference if you get free lunch, massages, $300k salary, RSUs? Are you still being exploited? Where’s the line...
Profit is the risk premium.
There are other examples, too; ones with even fewer exceptions. Our minds and bodies both help hoard energy; that trait-set was useful when animals were difficult to hunt, but today it just foments carb-poisoning, obesity and a raft of other pointlessly energy-efficient design tradeoffs. (The modern world is so much more energy-abundant than the ancestral landscape, yet we can't actually make use of anything past ~8 MJ a day for anything but high-endurance physical exertion. A human brain is like a Pentium II hooked up to a 500W PSU.)
I like to think that we're working towards a bigger goal than simply surviving.
We are not economic robots.
On a larger scale, trade persists across legal divides - with much of this facilitated via contracts, which are actually not excluded by the grandparent comment. Here what I am really claiming that contracts are a form of generalized price. So trade, coordinated work, productive efforts large and small, are basically all facilitated by people coming to agreement on price, one way or another (unless the type of coordination involves a group of friends coordinating via friendship - or maybe some generalized version of that). The "price" agreement itself may be long winded (e.g. a contract with many conditions) but it is the basic mechanism of price that coordinates so much. Even world peace. Nations that trade together are less inclined to go to war with one another. (Absent a coercive situation that is. Without coercion, trade is mutually beneficial, by the standards of the parties willfully involved, and nobody wars with their benefactor)
Therefore, I would argue that we only need generalized prices (and a lack of coercion) in order to coordinate peaceably. We do not need to agree on norms and etiquette. Of course, if one party decides to spoil things and coerce another into a bad deal, or into conforming to its norms, etc., law becomes more important. (Of course in reality somebody always tries to spoil things so law is important from the very beginning, especially locally. I might argue that law becomes weaker anyway as we scale up towards nation state scale coordination where laws differ on both sides and contracts sort of blend into treaties). I am making broad statements about large scale action and I don't like that. Maybe better to sum up the position by saying given basic conditions - 1. property rights that try to be consistent, 2. dependable and consistent legal protection, and 3. a functioning price system (the less manipulated the better), we can coordinate imperfectly, but better than expected given the vast swaths of differences of opinion, taste, and preferences, that make us so human.