How Every Interaction Ends

Every interaction you have with another person ends in one of three ways. You both come away better off. One of you comes away better off at the other’s expense. Or you both come away worse off. Understanding which of these is happening, in real time, is one of the most practical relationship skills there is.

The Fallacy of the Fixed Pie

Most of us default to thinking of interactions as a fixed pie: there’s a set amount of “good outcome” available, and if the other person gets more of it, we automatically get less. This is sometimes called the fixed-pie fallacy, and it’s a well-documented bias in negotiation research. It’s often wrong. Many situations aren’t zero-sum at all; there’s a genuinely bigger outcome available if both people work out what they actually need rather than assuming it’s identical to what the other person needs.

The negotiation researchers Roger Fisher and William Ury built much of their influential work around exactly this point: that the most valuable negotiations aren’t about splitting a fixed pie more favourably, they’re about finding the outcome that gives each side more of what they actually care about, which is often not the same thing.

Why Some People Default to Win-Lose

Some people, some of the time, will treat an interaction as win-lose even when it doesn’t need to be. Often that’s simple habit, formed in genuinely competitive environments where it was the sensible strategy. Sometimes it reflects a company culture, a family history, or plain scarcity, someone who has repeatedly experienced situations where being generous cost them dearly will reasonably become guarded. It’s worth remembering that most win-lose behaviour has a cause, and the cause usually isn’t “this person is a villain”, it’s circumstance, pressure, or learned habit. The genuine villains we covered a few lessons ago are a small minority; most people who play win-lose are doing it out of fear or habit, not malice, and that distinction matters for how you respond.

That said, some proportion of people, particularly under time pressure or when they believe they won’t face consequences, will default to taking an advantage if it’s offered to them. It’s worth going into any negotiation of real consequence with your eyes open about that, without assuming the worst of everyone you meet.

A Composite Example

I’ve worked with more than one pair of business partners who started a venture as equals, on good terms, with a handshake agreement about how things would be split. It rarely ends well when it’s left that loose. In the version of this story I see most often, one partner ends up doing more of the unglamorous, unpaid groundwork in the early months, while the other is better positioned, through connections or simple timing, to take credit once the venture starts succeeding. By the time the imbalance is obvious, there’s no formal agreement to fall back on, and what could have been resolved with a five-minute conversation at the outset becomes a drawn-out, expensive dispute.

The lesson isn’t “don’t trust your business partner.” It’s that clarity up front, about what a fair split actually looks like and what happens if circumstances change, protects a good relationship far better than assuming good intentions will be enough to sort it out later.

Reading the Interaction

A few practical questions can help you work out, in the moment, which kind of interaction you’re actually in:

• Is the other person asking questions about what you need, or only stating what they need?
• When you raise a concern, do they engage with it, or dismiss it and move straight back to their position?
• Does the proposed outcome actually cost them something, or is it free for them and costly for you?
• Would they be comfortable if the terms of this agreement were made fully visible to everyone involved?

None of these are foolproof, but together they give you a reasonable read on whether you’re heading toward a win-win outcome, or quietly being manoeuvred into a win-lose one.

What To Actually Do

Start from an assumption of good faith, most people, most of the time, aren’t trying to take advantage of you. But pair that assumption with clarity: put agreements in writing when the stakes are real, ask directly about what the other person needs rather than guessing, and pay attention when your questions are consistently deflected. Good faith and naivety aren’t the same thing, you can extend one without the other.

Further Reading

• Fisher, R., Ury, W., & Patton, B. (1991). Getting to Yes: Negotiating Agreement Without Giving In (2nd ed.). Penguin Books.
• Bazerman, M. H., & Neale, M. A. (1992). Negotiating Rationally. Free Press.
• Thompson, L. (2020). The Mind and Heart of the Negotiator (7th ed.). Pearson.
• Axelrod, R. (1984). The Evolution of Cooperation. Basic Books.
• Malhotra, D., & Bazerman, M. H. (2007). Negotiation Genius. Bantam.