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When Game Theory
Meets Human Reality

Classical game theory predicts what rational actors should do. The Behavioral Modifiers Framework predicts what real humans will do. The gap between those predictions is where the most actionable intelligence lives.

Colin McNamara — 2026

Two Fields, One Gap

Game theory and behavioral economics have operated in parallel for decades. One provides structure. The other provides realism. Neither provides both.

Classical Game Theory

Nash equilibria, BATNA computation, payoff matrices. Rigorous structure for modeling strategic interactions. But assumes players are rational actors who maximize expected utility.

GAP

Behavioral Economics

Loss aversion, endowment effect, status quo bias. Decades of research on systematic cognitive biases. But doesn't formalize deviations into equilibrium models a strategist can compute against.

Three Layers, One Bridge

The BMF sits between who the player is and what the model predicts, translating psychology into quantified payoff adjustments.

1
Layer 1
Psychological Profile
"Who is this player, psychologically?"
2
Layer 2 — Novel Contribution
Behavioral Modifiers
"How will their psychology distort their decision-making?"
3
Layer 3
Adjusted Game-Theoretic Model
"Given their biases, what will they actually do?"
Adjusted_Payoff = Classical_Composite × Π(bias_multipliers) + Σ(bias_additions)
Multiplicative biases scale the base. Additive biases shift it. The result: subjectively experienced payoffs.

12 Core Biases

Each bias has a definition, a litigation application, and a quantified adjustment factor. Together, they form the standard modifier set.

01
Loss Aversion
Losses hurt ~2x more than equivalent gains. Players in loss domains become risk-seeking — rejecting reasonable settlements.
1.5x – 2.0x on loss-domain payoffs
02
Endowment Effect
People overvalue what they possess. Asset holders demand above-market valuations in settlement.
+20–40% to holder's valuation
03
Status Quo Bias
Strong preference for current state. Stakeholders default to non-involvement despite rational incentives.
+15–25% to status-quo payoffs
04
Hyperbolic Discounting
Overweighting immediate outcomes vs. future consequences. Risky actions taken for short-term gain.
−30–50% on future consequences
05
Anchoring
First information sets the reference point. First evidence presented disproportionately shapes perception.
+10–20% for first-deployed evidence
06
Sunk Cost Fallacy
Continuing because of past investment. Parties deepen commitment to failing strategies.
+10–20% to abandonment cost
07
Commitment Escalation
Doubling down after public commitment. Filed positions become progressively more costly to reverse.
1.5x – 2.0x on reversal cost
08
Reactance
Resistance increases when freedom is threatened. Aggressive pressure may entrench rather than produce compliance.
Flip direction if threshold exceeded
09
Motivated Reasoning
Processing information to support desired conclusions. Damaging evidence gets reframed, not absorbed.
−20–40% evidence effectiveness
10
Framing Effects
How a choice is presented changes the decision. Same terms accepted or rejected based on frame.
±10–20% based on frame
11
Availability Heuristic
Overweighting vivid, recent information. One vivid piece of evidence outweighs fifty routine documents in perceived impact.
+15–30% for vivid evidence
12
Certainty Effect
Overweighting certain outcomes over probable ones. Guaranteed orders valued above expected-value equivalent.
+15–25% for certain outcomes

When Biases Collide

Biases don't operate alone. These combinations produce the most strategically significant — and puzzling — behaviors.

Loss Aversion + Sunk Cost
Maximum Resistance
Player is losing AND has invested heavily. Double barrier to rational concession. Settlement becomes nearly impossible.
Endowment + Reactance
Asset-Protection Fury
Inflated valuation meets autonomy threat. Produces disproportionately aggressive defensive behavior.
Commitment + Motivated Reasoning
Narrative Lock-In
Public positions + selective evidence processing. Strategy reversal becomes nearly impossible even with clear counter-evidence.
Status Quo + Hyperbolic Discounting
Inaction Paralysis
Current state feels safe, future benefits feel distant. Stakeholders stay uninvolved despite clear rational incentives.

Worked Example: The Cooperation Decision

A stakeholder in a multi-party negotiation. Classical game theory says cooperate. Observed behavior says otherwise. The BMF explains why — and what to do about it.

Payoff Gap: Cooperate vs. Defect
35
Classical Gap
collapses to
3
Adjusted Gap
Classical Analysis
70
35
Equilibrium
Cooperate is dominant (70 vs 35)
After Behavioral Adjustment
45
48
Adjusted Equilibrium
Near-indifference (45 vs 48)

Cooperate: 70 → 45

Classical payoff 70
Status quo bias −15
Hyperbolic discounting −10
Adjusted payoff 45

Defect: 35 → 48

Classical payoff 35
Status quo bias +8
Loss aversion +5
Adjusted payoff 48

Four Strategic Levers

The BMF doesn't just explain behavior — it identifies which levers shift the equilibrium back toward cooperation.

Counter Status Quo Bias
Create a new status quo. Establishing a clear reference point makes inaction feel less safe than action.
Counter Hyperbolic Discounting
Make consequences feel immediate. Concrete timelines collapse the temporal distance between comfort and consequence.
Exploit the Certainty Effect
Offer guaranteed protections rather than probabilistic promises. Tangible artifacts beat verbal assurances.
Use Framing Effects
Frame the ask as alignment with the person's own interests, not as a favor to the other party. Self-interest activates a different decision pathway than altruism.

Calibrate or It's Just a Story

Rigorous frameworks require calibration — tracking predictions against outcomes to refine the model over time. Without that discipline, there is no feedback loop.

80–100%
Near-Certain
60–79%
Probable
40–59%
Uncertain
20–39%
Speculative
A framework that explains everything after the fact
but predicts nothing before the fact is not a model
— it is a narrative.

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