What 40 years of negotiation research tells founders about how to actually close a deal

Founders negotiate constantly — with investors, customers, co-founders, acquirers. Almost none of them have read the research on what actually determines who wins.

Key Highlights

• The first number introduced in a negotiation exerts a disproportionate pull on the outcome — even when that number is arbitrary — deciding to go first or let the other party go first is one of the highest-leverage choices in any deal.
• Reactive devaluation describes the tendency to automatically discount a proposal or concession specifically because of who made it — a bias that systematically increases the longer a negotiation continues and the more adversarial the dynamic becomes.
• The single most consistent predictor of negotiation outcomes across 40 years of research is not persuasiveness, preparation, or experience — it is the quality of each party’s BATNA, their best alternative to a negotiated agreement, which determines how much pressure they can absorb before accepting unfavorable terms.

Getting to Yes was published in 1981.

The research it drew on had been accumulating for a decade before that. Forty-plus years later, the field of negotiation science has produced one of the most robust and practically applicable bodies of work in social psychology — and most founders have never read any of it.

This is not a criticism. Founders are busy. The gap between academic negotiation research and practical business advice is genuinely large. The summaries that exist in business books tend to strip out the mechanisms and leave only the tips, which are less useful than the mechanisms.

What follows is an attempt to bridge that gap. Not the full literature — that would take a book — but the six findings that show up across the most studies, produce the largest effects, and translate most directly to the kinds of deals founders are actually in.

“Founders who understand the psychology of negotiation don’t necessarily win more deals. They lose fewer — and they know why.”

Finding 1: The first number matters more than almost anything else

In their foundational work in the 1970s, psychologists Daniel Kahneman and Amos Tversky found that when people make judgments under conditions of uncertainty, they tend to rely heavily on the first number introduced into the conversation — even if that number is arbitrary or extreme. This tendency, the anchoring heuristic, turns out to be one of the most robust effects in the entire negotiation literature.

Research on first offers in negotiations consistently finds that the person who makes the first offer tends to achieve better outcomes, particularly when they know more than the counterpart about the true value of what’s being negotiated. The anchor doesn’t just pull the counterpart’s response — it pulls the entire subsequent negotiation. Concessions get measured relative to the anchor. Counteroffers get framed as adjustments to the anchor. The range of possible outcomes shrinks around it.

For founders, this has specific implications:

• In fundraising, waiting for the investor to name a valuation first is a common founder instinct. It often costs them. Founders who have a defensible anchor in mind and state it first tend to set a higher floor on the negotiation.
• In enterprise sales, letting the prospect define “budget” before you’ve introduced pricing means you’re negotiating inside their frame rather than yours. The research suggests you want your number in the room first.
• In acquisition conversations, the first number on the table in an M&A process has a disproportionate effect on where the deal lands, even through extensive further negotiation.

The calibration question is: when do you know more than your counterpart about value? When you do, go first and go high. When you genuinely don’t — when the counterpart has information you lack — let them anchor and adjust from there.

Finding 2: Your BATNA is your entire source of power

Fisher, Ury, and Patton introduced the concept of BATNA — Best Alternative to a Negotiated Agreement — in Getting to Yes in 1981, and subsequent research has only reinforced its centrality. Your BATNA is what you will do if this deal doesn’t happen. It is not your bottom line. It is not your walkaway price. It is the concrete, realistic alternative that exists independent of this negotiation.

Negotiators who are armed with a strong BATNA tend to set higher goals, make more ambitious first offers, and claim more value than those who are not.

This finding has a direct implication that most founders underestimate: the work of building your BATNA happens before the negotiation, not during it. A founder entering an investor meeting with one term sheet in hand has a weak BATNA. A founder entering with three term sheets has a strong one — and the behavioral research shows they will negotiate differently, more ambitiously, and more successfully, without any tactical changes whatsoever.

The failure mode is what researchers call BATNA neglect: founders who enter negotiations focused on the deal they want, without having invested in building the alternative they need. The investor or acquirer on the other side of the table is often highly experienced at reading BATNA strength. Desperation — the absence of a good alternative — is almost always detectable, and it consistently produces worse outcomes for the party experiencing it.

Three ways founders can strengthen their BATNA before a negotiation:

• Run a competitive process. Multiple investors, multiple potential acquirers, multiple enterprise prospects. The process itself creates BATNA.
• Keep building. A company that is visibly making progress during a fundraise has a stronger BATNA than one that is standing still — because the implicit alternative (“we keep building without this deal”) becomes more credible.
• Name your alternative explicitly, to yourself. “If this doesn’t close, I will do X” is a more powerful position than “I really hope this closes.” The specificity of your own BATNA affects your behavior even when the other party doesn’t know what it is.

Finding 3: Reactive devaluation erodes every concession you make

This is the finding most founders have never heard of, and it may be the most immediately applicable.

Reactive devaluation was formally identified by Lee Ross and Constance Stillinger in 1991, in the context of nuclear arms negotiations between the United States and the Soviet Union. They found that the same proposal would be rated as reasonable and fair when attributed to one’s own side, and as insufficient or suspicious when attributed to the opposing side — with the content of the proposal identical in both cases.

The bias was formally identified by psychologists Lee Ross and Constance Stillinger in 1988, in the context of nuclear arms negotiations. For one group, the proposal was attributed to the Reagan administration. For another group, it was attributed to the Soviet Union. The results were striking. When the proposal was attributed to the American side, participants rated it as reasonable and fair. When the identical proposal came from the Soviet side, it was rated as inadequate.

The mechanism: the very fact that the other party has offered something makes it seem less valuable. Concessions made by an opponent tend to be perceived as less significant than identical concessions made by oneself. The more adversarial the dynamic, the stronger the effect.

For founders, this shows up in a specific pattern. A founder who makes a concession in a term sheet negotiation — say, accepting a slightly lower valuation in exchange for better governance terms — will often find that the investor responds not with gratitude or reciprocation, but with an immediate push for the next concession. The concession wasn’t valued; it was devalued, precisely because it came from the other party.

The practical countermeasure: make the other party feel they generated the concession rather than received it. This is not manipulation — it’s reading the research accurately. Framing a concession as a response to their specific stated interest (“I heard that governance certainty matters to you, so let me propose…”) produces better reception than framing it as your voluntary offer. The research suggests the source attribution matters as much as the content.

Finding 4: Framing as loss versus gain changes what the other party will accept

Kahneman and Tversky’s prospect theory, developed in 1979, found that people are more motivated to avoid losses than to acquire equivalent gains — the asymmetry runs roughly two to one. This finding has been replicated across hundreds of studies in dozens of contexts, and it applies directly to negotiation.

Research on negotiation framing found that negotiators are more inclined to make concessions when an offer is framed in the domain of losses — emphasizing the cost of rejection — than when the same offer is framed in the domain of gains — emphasizing the benefit of acceptance. This effect is not subtle. It consistently produces materially different acceptance rates for the same underlying terms.

For founders in enterprise sales, this translates directly. “Our platform will increase your team’s productivity by 20%” and “Your team is currently losing 20% of its productive capacity to the workflow problem we solve” describe the same value proposition. Research consistently finds the second frame produces faster decisions and fewer objections.

For founders in investor negotiations, “This deal gives you a path to a 10x return at our target exit” and “Without moving at this valuation, you’ll miss the investment opportunity as we raise at a significantly higher price in six months” are different framings of the same situation. The loss frame is more motivating — though it needs to be delivered credibly, or it reads as pressure rather than information.

The calibration: use loss framing when the counterpart is hesitating and the cost of inaction is genuinely real. Use gain framing when building long-term relationship — loss framing can generate resentment if overused.

Finding 5: The fixed-pie assumption destroys value in almost every deal

One of the most consistent findings in negotiation research is that negotiators systematically assume the negotiation pie is fixed — that whatever one side gains, the other side loses. This assumption is almost always wrong, and acting on it consistently produces worse outcomes for both parties.

Research by Bazerman, Thompson, and colleagues across the 1980s and 1990s found that negotiators consistently miss opportunities for mutually beneficial trade-offs because they assume their preferences on issues are incompatible with those of the opponent, even when they are quite compatible. Two parties who genuinely have different priorities can almost always find trades that make both sides better off than a straight split.

For founders, the specific application is term sheet negotiation. Founders and investors often negotiate valuation as if it were a zero-sum exchange — every point of valuation the founder wins is a point the investor loses. This framing is accurate for valuation. It completely misses the rest of the deal.

An investor who genuinely values governance certainty may be willing to accept a significantly higher valuation in exchange for specific board governance provisions. A founder who genuinely values operational autonomy may be willing to accept a lower valuation in exchange for information rights limitations. A customer who genuinely values long-term pricing predictability may be willing to pay more annually in exchange for a multi-year commitment.

The question that unlocks value in almost any negotiation is: “What do you care most about in this deal that isn’t the primary price number?” Founders who ask this question — and mean it — consistently find that there are trades available that the original framing made invisible.

Finding 6: Optimistic overconfidence reliably produces worse outcomes

The final finding is the most uncomfortable. Research consistently finds that negotiators overestimate their own capabilities and underestimate those of the other side — resulting in overestimation of their leverage, overestimation of the quality of their BATNA, and underestimation of how prepared and experienced the counterpart is.

This overconfidence effect is particularly pronounced among founders. Founders by selection are optimists. They have built something under conditions where optimism was a survival trait. They enter negotiations that are genuinely high-stakes — fundraises, enterprise deals, acquisitions — with the same optimistic orientation they bring to product development. In product development, optimism is often useful. In negotiation, it produces a specific set of errors.

The founder who assumes their term sheet is the best available tends not to run the competitive process that would create the BATNA that would make the term sheet actually better. The founder who assumes the investor is more eager than they appear makes smaller, more conservative asks. The founder who assumes a customer is close to signing stops doing the discovery work that would reveal the actual objections.

The correction is not pessimism. It is calibration — deliberately accounting for the ways overconfidence produces predictable errors, and building processes that compensate for them. Running the competitive process even when you don’t feel like you need it. Making the ambitious first offer even when the number feels too high. Asking the uncomfortable question about what the counterpart actually cares about rather than assuming you already know.

What these six findings share

They all describe the same underlying thing: negotiation outcomes are determined less by who is smarter or more persuasive, and more by who understands and accounts for the systematic cognitive biases that operate on both sides of the table.

The investor who pushes back on your valuation isn’t necessarily doing so because your company is worth less than you think. They may be doing so because your anchor was too weak, because their BATNA is better than you realized, or because the reactive devaluation bias is making your concessions feel insufficient rather than generous.

Understanding the mechanism is more useful than any specific tactic. Tactics are responses to specific situations. Mechanisms are the structures underneath every situation you’ll ever be in.