How Zero-Sum Beliefs Get in the Way of Fairness — Iris Bohnet & Siri Chilazi (2025)
Authors: Iris Bohnet and Siri Chilazi
Published: behavioralscientist.org, February 2, 2025
Adapted from: Make Work Fair: Data-Driven Design for Real Results (HarperCollins, 2025)
Raw source: raw/How Zero-Sum Beliefs Get in the Way of Fairness - by Iris Bohnet and Siri Chilazi.md
Central Claim
The mythical fixed-pie mindset (Max Bazerman’s term) — the assumption that fairness is zero-sum, that one group’s gain must come at another’s loss — is both empirically wrong in most workplace situations and actively harmful when people believe it.
The empirical corrective: making work fair expands the pie for everyone.
The Fixed-Pie / Zero-Sum Belief
Zero-sum thinking: every gain for one party equals a loss for another. Genuine zero-sum situations do exist (Olympic medal counts, legislative seats, price negotiations). But in most workplace and economic contexts, they are the minority case — not the default.
The research on zero-sum gender beliefs:
- Men’s zero-sum thinking increased when exposed to information about women’s gains in education, politics, and the workplace over the last century
- This increase, in turn, increased sexist attitudes and lowered support for workplace equity policies
- Zero-sum beliefs about gender at work reflect broader zero-sum beliefs about women’s gains coming at men’s expense — more pronounced in men than women
The mechanism: information that should feel like a win for society (more people participating in the economy) gets reframed as a threat by zero-sum thinkers.
The Economic Evidence for Positive-Sum Fairness
- 40% of per-person economic growth post-1960 is attributable to better talent allocation — specifically, the inclusion of women and minorities who were previously excluded from professional roles
- In 1960, 94% of doctors and lawyers were white men. The expansion of who could hold these roles wasn’t a transfer from one group to another; it was a net increase in total economic output
- Sandra Day O’Connor — top of her Stanford Law class in 1952 — could only get a job as a legal secretary. The loss to the legal system from that misallocation is not recoverable, but the lesson is clear
The Curb-Cut Effect
The Americans with Disabilities Act (1990) required public accessibility improvements — elevators, access ramps, lowered curbs — for the ~4% of adults (8M+ people) with mobility disabilities. Today that share is 12% (30M people).
But everyone benefited: people with suitcases, strollers, grocery carts, bicycles. A design intervention intended to help an edge case turned out to improve the experience for the majority.
This is the curb-cut-effect: designing for the edge case expands the pie for the center. Fairness isn’t redistribution; it’s often a system redesign that works better for everyone.
The Problem with the Business Case for Diversity
The article goes further than most: making the business case for diversity is itself counterproductive.
- Research (Georgeac & Rattan): the business case causes underrepresented groups to anticipate lower belonging at organizations that use it. LGBTQ+ individuals, women in STEM, and African Americans were less interested in joining organizations that framed diversity through a business ROI lens
- Ely & Thomas: “Enough Already with the Business Case” — the business case sends the message that underrepresented colleagues are only valuable instrumentally
- The fairness case is better — but the deepest argument is: no justification is needed at all
The RBG insight: no one has ever asked men to justify their presence in positions of power. Only people not currently in power are asked to make the case. That asymmetry is itself an expression of the problem.
Quote from Kang & Kaplan: “To make progress in achieving gender equality, we must declare the discussion on whether and why we should pursue equality to be over.”
Key Takeaways
- Zero-sum beliefs are empirically wrong in most workplace contexts — and actively harmful when held
- Fairness is not redistribution; it’s expansion (better talent allocation = higher total output)
- Design for the edge case benefits everyone (curb-cut effect)
- Don’t make the business case for fairness — it backfires; treat fairness as a given
- The asymmetry of who is asked to justify their presence is itself evidence of the problem
Cross-Thread Connections
- zero-sum-thinking: The core concept; this article provides the behavioral research and economic evidence
- curb-cut-effect: Named phenomenon introduced here; design for edge cases benefits everyone
- prisoners-dilemma: The zero-sum/positive-sum distinction maps directly onto the PD framework — zero-sum thinkers are stuck in the one-shot defection equilibrium; positive-sum thinkers see the iterated cooperative outcome
- invisible-hand: Adam Smith’s invisible hand describes a positive-sum market. This article documents how zero-sum beliefs distort that positive-sum potential by blocking talent allocation
- inclusive-institutions: Workplace fairness is the micro-level version of institutional inclusivity — both are about expanding participation to unlock economic potential
- loss-aversion: Zero-sum thinking is partly a product of loss aversion — men perceive women’s gains as their losses even when the actual outcome is positive-sum, because losses loom larger than gains
- framing-effects: The business case vs. fairness case is a framing effect — different framings of the same goal (more diversity) produce different responses from target audiences
- wysiati: Zero-sum thinkers see what’s available (current allocation) and treat it as all there is — they miss the possible expansion of total value through fairer allocation
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