Managing boundaries in negotiation can be extra hard, for a couple of reasons. A negotiator is there to persuade, to move the other party towards compromise and agreement. That is just the nature of deal-making, and persuasion is a skill negotiation rewards. To convince someone, you first have to understand their point of view, then present your solution as a fair compromise, something mutually advantageous. To do that, you have to engage with the other person’s thinking, read the room, and tailor your message accordingly. And that is the tricky part: negotiation works right at the boundary. You step up to the edge of another person’s inner world and try to move them. What keeps it legitimate, rather than a violation, is that the engagement is mutual and consented to. The other party is doing exactly the same to you, trying to influence you, to convince you of what is right, fair, and advantageous. You have both agreed to be worked on. At times you might feel nervous or tense, but you engage anyway, because in the end a good deal can leave everyone better off, despite the initial friction.
Most people negotiate in good faith, yet a small but significant proportion habitually cross the line, through deception, manipulation, aggression, or intimidation. In regulated fields an outright lie can count as misrepresentation, which may allow the other party to unwind the deal or sue. So the careful ones mislead without lying: they omit inconvenient facts, tell half-truths, or use puffery like ‘the best deal in town’, which is hard to argue with because it’s only an opinion. Others simply bury the catch in small print, or in language too complex to follow.
There’s a whole family of these tricks aimed at hiding cost or detail, and it has a name: sludge, the greedy cousin of the nudge. Nudging is choice architecture, arranging the options so a good decision is easy. Sludge does the reverse: it buries the true cost and overcomplicates the offer, so people believe they’re getting a far better deal than they are (Thaler & Sunstein, 2021). Technically it isn’t lying, the numbers do add up, but it exploits our limited capacity to do complicated arithmetic on the spot. Without a calculator and a little time, buyers fall back on trust and on the figures the seller hands them, and under pressure like ‘the deal expires today’, they commit to what only looks fair. The real cost often surfaces later, at the insurance claim, when they find they paid a hefty premium but can only claim within a narrow window. Sludge is a boundary crossing precisely because agreement is reached without informed consent: the buyer never fully understood what they agreed to.The practice of quietly raising premiums for loyal customers at renewal, price walking, was banned by the FCA in January 2022 for home and motor insurance. Some of these techniques are so common that buyers who catch them aren’t even offended, they just calmly say no. But people also kid themselves, convincing themselves they got a better deal than they did, because telling yourself the purchase was top quality after all is more comfortable than admitting you were fooled.
Most often, sludging is done with velvet gloves. Outside the confusing maths, the fine print, and the deal details, shoppers are welcomed warmly and treated well, and the encounter is as polite and friendly as it can be. But some deal-makers prefer to play hardball. They cross the line by messing the other party around, threatening, issuing ultimatums, changing their mind, going back on agreed terms. The negotiators who use these tactics may genuinely hold more leverage, or may simply bluff, making the other side believe they have more clout than they do.
So why do some choose to do business this way? A couple of reasons. Some have a cynical worldview and assume the world is dog-eat-dog. Cynicism is the engine that drives them. They treat their counterparts as adversaries, so they move to exploit first. And the other side, handled as an enemy, naturally grows wary, pushes back, or edges towards the door, which the cynic then reads as proof he was right all along. So they get back exactly what they expected. Morton Deutsch described how suspicion tends to breed suspicion, each side’s wariness confirming the other’s (Deutsch, 1973). Other deal-makers aren’t especially cynical, but simply entitled, intent on their own success and caring little for the person across the table. And unfortunately, many who play hardball are rewarded more than they should be, at least in the short term. That reward creates a positive-reinforcement loop, which keeps them reaching for the same heavy-handed tactics again and again.
And how about boundaries in personal relationships? Away from the business world, boundaries are negotiated every day, from our most important relationships to our most fleeting encounters. The cynic doesn’t leave his cynicism at the front door, and the entitled deal-maker is no different at home. None of this is about vilifying competitiveness or edge. Negotiation is fair competition, and people should expect to do as well as they can. What makes some behaviour problematic is the boundary crossing, the manipulation and exploitation, not the competing itself. And crossing certain lines is expensive, because over time it attracts retaliation and ill will. Spend long enough in any industry and your reputation precedes you. Even though behaviour depends on the situation and not on personality alone, once a pattern is set, we expect the next move to follow it rather than depart from it.
Just as in business, boundary crossing in personal life can be every bit as exploitative, and it happens in the most casual of ways. One friend always wants to meet on their terms. Some partners always choose the holidays, the restaurants, the house you buy together, even how you spend your weekends. Some mothers make disparaging comments about your weight, or how you raise your children. In-laws complain about your spending. And on it goes. Some of these crossings are genuinely well-meant. Maybe it really isn’t ideal that the grandchild has a whole chocolate bar for breakfast every day.
But the real giveaway that a boundary has been crossed is usually the delivery. The concern doesn’t land in a calm, sensible, well-meaning way. It arrives as a dig, a harsh remark, a demand, an expectation, a value judgement. Each signals that the other person is on a high horse, that they hold the moral authority, or the entitlement, to judge you or to demand things of you.
And that is exactly the mechanism of a boundary violation: the advice is uni-directional, not mutual. One person assumes the role of the expert. A joke becomes a dig in the same way, when someone takes liberties in the relationship while still expecting to be treated with respect.
The giveaway is how it lands. When you ask for someone’s counsel, they might talk with you about your private affairs, but you consented to it, so there is no crossing. The difference is when you don’t welcome the advice, when you feel judged, or when the other person decides they know what is right for you.