⚠️ Mistakes & pitfalls
The negotiator's cognitive traps
Classic mistakes and negotiator biases: M. Bazerman & M. Neale ("Negotiating Rationally"), D. Kahneman (biases and heuristics), L. Thompson.
Full detail in the “Origin & history” section below.
Author of the library
Negotiation lecturer at KEDGE Business School
A rare threefold background serving negotiation: teaching, commercial justice and audit, backed by experience as a company director in Bordeaux.
Over-concession is the mistake of giving too much, too fast and without a trade-off, to the point of shifting one's own anchor downward and destroying value before the other party has even had to work for it. Far from soothing the relationship or speeding up the agreement, it teaches the counterpart that pressure, waiting and insistence pay off, which prompts them to ask for more. Research shows that a series of decreasing or overly generous concessions leads the beneficiary to make less ambitious counter-offers only when they are perceived as a signal of weakness; an unsignalled, untracked and non-reciprocal concession durably weakens one's position. It is less an offensive technique than a behavioural trap to spot in oneself and to provoke in the other only deliberately.
At a glance
Vigilance: high (7.0/10) · Preparation required: 3/10
Indicative profile: it situates the “Mistakes & pitfalls in negotiation” family as the Mistakes & pitfalls school practises it, not this technique taken in isolation. Techniques from the same family and school therefore share the same profile. NEGOCOACH editorial rating out of 10, non-experimental · the higher the “relational risk” value, the more costly the technique is to the relationship.
NEGOCOACH assessment
Tactical potential 3.7/10 (effectiveness, impact, discretion) and vigilance high (relational and ethical risk): two distinct readings, deliberately never merged into a single score that would reward risk. NEGOCOACH editorial rating calibrated from the “Mistakes & pitfalls in negotiation” family and the “Mistakes & pitfalls” school. Each criterion is rated out of 10; click to understand what it measures.
How far the technique can carry the negotiation in the intended direction when it is well executed.
Strength of the effect produced on the counterpart's perceptions, emotions and decisions.
How hard it is for the other party to notice the technique is being used. A high value = very discreet.
The information, analysis and rehearsal required upfront to use it effectively.
Potential cost to the relationship and to trust if the technique is spotted, refused or fails. A high value = riskier.
Moral acceptability: fairness, transparency and respect for the counterpart's autonomy. A high value = more defensible.
Documented school
The school this technique stems from is documented by recognised work and established practice, without experimental consensus. This indicator qualifies the school, not this technique taken in isolation.
Indicative NEGOCOACH editorial rating, for teaching purposes. For “Relational risk”, a high value signals a cost to the relationship, not a quality.
Over-concession is not a "technique" patented by a single author: it is a mechanism identified by research on concession-making. Its conceptual roots go back to work on reciprocity and tension reduction (Charles Osgood's GRIT model, 1962), to the principles of distributive negotiation popularised by Chester L. Karrass ("The Negotiating Game", 1970) and to the Harvard school (Fisher, Ury & Patton, "Getting to Yes", 1981), which contrasts positional concession with argumentation based on objective criteria. Its most recent and most rigorous empirical formalisation is due to Tey, Schaerer, Madan & Swaab (2021, Organizational Behavior and Human Decision Processes), whose seven studies (N = 2,311) establish that a poorly calibrated concession pace alters the beneficiary's expectations and behaviour.
Over-concession refers to granting a concession whose size, speed or frequency exceeds what the situation requires, without obtaining an equivalent trade-off or valuing the gesture. Operationally, it is recognised by three markers: (1) the gap between the offer and the previous one is disproportionate to the stakes; (2) the concession is made unilaterally, before any reciprocity, often to "unblock" or soothe; (3) it shifts the conceder's own anchor, that is, it redefines downward the reference point from which the rest of the negotiation plays out. It turns a lever (a traded concession) into a leak of value (a given concession).
Application by context
A salesperson, sensing the customer's hesitation, immediately grants a 15% discount "to close today" without asking for anything in return: they teach the customer that the real price was lower and invite them to negotiate further on delivery and warranty.
A buyer, eager to secure a supplier, raises their offer from 8% to 14% in a single jump at the first follow-up, signalling that they still have room and pushing the seller to hold their positions rather than reciprocate.
During a pay negotiation, management concedes straight away on the general pay rise demanded, without a trade-off on working-time arrangements, turning its opening gesture into a new floor from which the unions reopen other demands.
In a hostage-taking or crisis situation, conceding a major demand too quickly (ransom, release) without obtaining proof of life or a reciprocal gesture strengthens the taker's stance and fuels an escalation of demands.
A government that, under street pressure, withdraws a bill and simultaneously announces several additional, unrequested financial measures shifts the cursor of expectations itself and makes the next protest more demanding.
A seller, after a single lukewarm viewing, lowers their price by €25,000 before even receiving a written offer: the buyer concludes that the property is overvalued and makes a proposal even lower than the new listed price.
Faced with a partner from a culture where lengthy negotiation is a sign of respect, an "efficient" Westerner who quickly releases their best terms is seen as unserious or in a position of weakness, and is asked for more.
A parent who, to cut short a tantrum, immediately gives in on the screen, the dessert and bedtime teaches the child that emotional intensity is the fastest way to obtain cumulative concessions.
Counter-techniques
Negotiation is also played on defence. Here is how to recognise this technique when it is used against you, and turn it around.
The signals that give it away
The counters that defuse it
Turn it into an advantage
Name the manoeuvre: said out loud, a technique loses most of its power.
Reacting emotionally instead of coming back to the facts.
Strengths (paradoxical): over-concession can genuinely break a deadlock, reduce immediate relational tension, signal goodwill and speed up closing, useful when the cost of delay exceeds the value given up, or when one deliberately seeks to initiate reciprocity (GRIT logic). Used knowingly, a broad but single and well-signalled concession can create a credibility shock. Weaknesses: it destroys value, shifts one's own anchor, sets a precedent ("appetite comes while negotiating"), weakens the credibility of one's future positions and, according to Tey et al. (2021), when it takes the form of decreasing concessions perceived as an admission of a limit, it leads the beneficiary to revise their expectations to their advantage. It also exposes one to nibbling and to a spiral of demands.
A broad concession is justified only in specific cases: when the cost of time or failure clearly exceeds the value given up; when one voluntarily initiates a cycle of reciprocity in a long-term relationship (GRIT approach); when a symbolic opening gesture is needed to restore trust; or when one has real margin and releases it in explicit exchange for a trade-off of at least equivalent value. Conversely, the over-concession trap lies in wait mainly under time pressure, in information asymmetry, in situations of conflict aversion, at the end of a negotiation (a rushed "closing") and when facing an opponent who exploits silence or waiting.
Sales · The discount that opens the breach, Representative B2B sales scenario. A software vendor negotiates an annual contract. Faced with a silent buyer who lets the reply drag on, the salesperson spontaneously offers a 20% discount "valid if you sign this week". The buyer does not sign: they reply that the budget remains tight. The salesperson then adds three free months, then free training. Result: the buyer has obtained, without ever making a quantified counter-offer or conceding anything, three cumulative concessions. The seller has shifted their own anchor from -20% to -35% in value, and the buyer has learned that patience was enough to drive the bidding up. A single, quantified and conditioned concession ("-10% against a signed 24-month commitment today") would have preserved value and credibility.
Business · The social opening that became the floor, Representative collective-bargaining scenario. During annual pay talks (NAO), management opens by immediately granting the 3% general pay rise demanded by the employee representatives, hoping to create a constructive climate. Having failed to signal that this was a maximum gesture and to ask for a trade-off (flexibility, freezing a bonus, a commitment on absenteeism), management sees this 3% become the new starting point: the unions consider the demand satisfied and reopen the discussion on meal vouchers, remote work and an exceptional bonus. The concession, untracked and non-reciprocal, shifted the anchor and restarted the cycle of demands instead of closing it.
To recognise that we are being pushed into over-concession: beware of prolonged silence, calculated waiting, the "it's almost there, just a small gesture is missing" (nibbling) and artificial time pressure. To defend yourself: anchor first and firmly; slow the pace, do not fill silences with a new offer; systematically condition any concession ("I can do X only if you do Y"); reduce the amplitude at each round to signal that you are approaching fair value, but choose this signal, do not be subjected to it; track each concession in writing and recall the expected trade-off; finally, prepare your BATNA (best alternative to a negotiated agreement) so as not to give in out of fear of failure. Against an opponent who over-concedes, stay patient, do not reciprocate mechanically and let the movement continue.
Over-concession describes a risk, not an inevitability: not all fast concessions are mistakes, and a dogmatic reading ("never concede first") can block mutually beneficial agreements and damage the relationship. Ethically, deliberately exploiting another's tendency to over-concede (manipulative silence, false urgency, nibbling) belongs to competitive negotiation that can undermine trust and the long term; in integrative or relational negotiations, calibrated and reciprocal generosity is often superior. Finally, in contexts of crisis, vulnerability or marked power asymmetry (negotiating with an isolated employee, an over-indebted individual), pushing the other to over-concede can be not only counterproductive but morally questionable.
Related techniques and notions: nibbling, which exploits end-of-negotiation micro-over-concessions; anchoring (Tversky & Kahneman), whose displacement is the heart of the trap; the diminishing concessions strategy which, well dosed, is the antidote and, poorly dosed, the poison; Osgood's GRIT model (a calibrated unilateral concession to initiate reciprocity); the conditional trade-off ("if… then…"); Cialdini's principle of reciprocity; the "flinch" (a visible reaction to an offer) and strategic silence as triggers of over-concession in the opponent; and finally the BATNA, which protects against concessions dictated by fear.
Quick exercise
Answer in your head, then reveal the solution. Memory is built through active recall.
Frequently asked questions
Over-concession is the mistake of giving too much, too fast and without a trade-off, to the point of shifting one's own anchor downward and destroying value before the other party has even had to work for it. Far from soothing the relationship or speeding up the agreement, it teaches the counterpart that pressure, waiting and insistence pay off, which prompts them to ask for more. Research shows that a series of decreasing or overly generous concessions leads the beneficiary to make less ambitious counter-offers only when they are perceived as a signal of weakness; an unsignalled, untracked and non-reciprocal concession durably weakens one's position. It is less an offensive technique than a behavioural trap to spot in oneself and to provoke in the other only deliberately.
It sits on the line: effective, but it can tip into manipulation if it exploits an information asymmetry. Use it with measure and without deliberate deceit.
Reacting emotionally instead of coming back to the facts. The right reflex: slow down and reformulate.
NEGOCOACH does not assess the experimental validation of this technique in isolation. What we document is the grounding of its source school (Mistakes & pitfalls): documented school. Full detail is in the "At a glance" section of this page.
Practise with AI
Copy, paste into your assistant, replace the [brackets]. Works with ChatGPT, Claude, Gemini, Mistral, Perplexity.
Build your plan before the meeting
You are an expert negotiation coach. Help me prepare to use the "Over-Concession" technique in the following situation: [describe your situation]. Give me: the conditions for success, a 3-step script, my counterpart's likely objections and how to answer them.
Rehearse against an AI counterpart
Play the role of my counterpart in a negotiation. I am going to test the "Over-Concession" technique. React realistically and with resistance, do not give in too quickly, then at the end analyse my performance and suggest 3 concrete improvements.
Analyse a past negotiation
Here is how my negotiation went: [paste the exchanges]. Analyse whether the "Over-Concession" technique was used well, what worked, the mistakes made, and spell out precisely what I could have done better.
References
Founding works of the ⚠️ Mistakes & pitfalls school this technique belongs to.
Negotiating Rationally
BookM. Bazerman & M. Neale · 1992
Thinking, Fast and Slow
BookD. Kahneman · 2011
The sum of Kahneman's work on decision-making: two systems of thought, one fast and intuitive, the other slow and analytical, and the long list of biases that distort our judgements. Essential to understanding others... and yourself.
The Mind and Heart of the Negotiator
BookL. Thompson · 2015
Classic mistakes and negotiator biases: M. Bazerman & M. Neale ("Negotiating Rationally"), D. Kahneman (biases and heuristics), L. Thompson.
On video
Videos to picture Over-Concession and anchor it through examples.
A verified video selection is being enriched; the search above already surfaces the best videos on the topic.
Technique map
Every technique sits within a network: what it draws on, what it combines with, where it applies, and how to defend against it.
Spot its signals, neutralise it and turn it around with the defensive playbook on this page.
See the counter-techniquesOver-concession is the mistake of giving too much, too fast and without a trade-off, to the point of shifting one's own anchor downward and destroying value before the other party has even had to work for it. Far from soothing the relationship or speeding up the agreement, it teaches the counterpart that pressure, waiting and insistence pay off, which prompts them to ask for more. Research shows that a series of decreasing or overly generous concessions leads the beneficiary to make less ambitious counter-offers only when they are perceived as a signal of weakness; an unsignalled, untracked and non-reciprocal concession durably weakens one's position. It is less an offensive technique than a behavioural trap to spot in oneself and to provoke in the other only deliberately.
Name the manoeuvre: said out loud, a technique loses most of its power.
Reacting emotionally instead of coming back to the facts.
Our programmes turn theory into a concrete advantage.