Behavioral economist · Masaryk University

I study the forces that shape economic behavior—from individual beliefs to workplace inequality.

I am a behavioral economist using experiments, theory, and applied micro data to study belief formation, decision-making, moral behavior, and inequality. Across these settings, I ask how people interpret evidence when beliefs have personal or social consequences.

Fields
Behavioral · Experimental
Methods
Lab · Theory · Applied micro
Gergely Hajdu
Currently inBrno, Czechia

News

  1. I will attend the 2026 European Meeting of the Economic Science Association in Barcelona.

Selected research

From individual decisions to organizational inequality.

My research connects belief formation, learning, moral behavior, and the organization of inequality using experiments, theory, and linked administrative data.

Click a card to turn it over and read the abstract.

02Working paper · Under review

Overconfidence Due to a Self-reliance Dilemma

with Nikola Frollová

The decision to rely on oneself can itself distort beliefs about relative performance and create overconfidence.

Read the paper
03Journal of Economic Behavior & Organization · 2025

Lengthy Waiting Corrupts, Especially When Unexpected

with Linda Dezső and Yossef Tobol

Waiting longer increases dishonest behavior, with an especially strong response when the delay is unexpected.

Read the paper
04Working paper

Choice-induced Sticky Learning

with Balázs Krusper

After choosing, people respond less to new information about both chosen and rejected options—even when attention does not differ.

Read the paper

Research library

Research portfolio

Browse working papers, active projects, and selected projects on hold. Open any title for details.

Working papers

04
01Under reviewInformed Choice Increases Perceived Quality Gapwith Balázs Krusper

Abstract

We study in the lab how choosing one of two products affects beliefs about their qualities. In a between-subject design, we randomize both ownership mode—choice versus assignment—and whether a product appears favorable by pairing it with an objectively better or worse alternative. This allows us to estimate the causal effect of choice on the perceived quality gap while accounting for contrast effects. We find that choosing magnifies the belief gap between the owned and unowned alternative, driven almost entirely by newly formed pessimistic beliefs about rejected options. Prompting participants to focus on product qualities before choosing attenuates the effect, suggesting an important role for attention. The results help explain reduced switching and markups among near-identical products, and support active-choice policies over opt-out defaults.

Open paper
02Under reviewOverconfidence Due to a Self-reliance Dilemmawith Nikola Frollová

Abstract

Overconfidence can arise—or be exacerbated—because of a decision problem itself. In organizational settings, delegation requires decision makers to choose whether an outcome depends on their own performance or another person’s. We test whether this self-reliance dilemma induces motivated reasoning about relative performance. Participants perform a real-effort task and later decide whether to be paid based on their own or another participant’s performance. We vary whether they learn about this decision before or after reporting beliefs. Learning about the dilemma first leads participants to report a smaller performance advantage for the counterpart and to believe incorrectly more often that they outperformed them. These belief distortions arise even though delegation itself is unaffected.

Open paper
03Working paperChoice-induced Sticky Learningwith Balázs Krusper

Abstract

After purchasing a product, people receive new information about both chosen and rejected alternatives. We study whether choosing changes how this later information is processed. Participants learn about the fundamental quality of financial investments through repeated price changes; we compare people who chose investments themselves with people who received them exogenously. Learning is stickier after choice: participants react less to both good and bad news about owned and non-owned investments. The effect is not explained by greater attention to chosen investments. A structural model shows that learning after allocation is close to the Bayesian benchmark, while learning after choice is too sticky.

Open paper
04Single-authored working paperExcusing Beliefs about Third-party Success

Abstract

I investigate whether people distort beliefs about third parties—such as the ability of scientists to offset one’s environmental impact—to excuse self-interested behavior. In a laboratory experiment, participants choose how much money to take. Whether this money is taken from passive participants depends on a third party’s success in solving a riddle. Treatments differ only in whether success or failure makes the choice harmful to others. Beliefs about third-party success are 13 percentage points higher when failure makes the choice harmful. With monetary incentives for correct beliefs, the gap falls to 6 percentage points and is statistically insignificant. The results suggest that people use beliefs about third-party success as excuses.

Open paper

Work in progress

05
01Methodological experiment · Under reviewCarry-over Effects in the Within-subject Spectator Taskwith Linda Dezső, Valeriia Chukaeva, and Antal Ertl

Project summary

This methodological experiment tests whether repeated redistribution decisions within a spectator task create carry-over effects: whether exposure to merit- or luck-based inequality in an earlier decision influences redistribution choices in a later one.

02Work in progressInternal Belief Constructs and Motivated Information Acquisitionwith Kathleen Ngangoue, Keyu Wu, and Yan Xu

Project summary

This project studies how people’s internal representations of uncertain states shape which information they acquire, particularly when some interpretations are more psychologically attractive than others.

03Work in progressSinners and Saints: How Narratives Affect Moral Behaviourwith Dan McGee

Project summary

Choices are informative about moral character, but people interpret them within narratives about others’ conduct. We model agents who care about self-image and can choose beliefs about others within the limits of plausibility. In a hypothesis-testing equilibrium, agents can hold self-serving beliefs when those beliefs remain rationalizable and sufficiently plausible. Limited information can therefore let people excuse selfish behavior or acclaim moral behavior, while full information restores accurate beliefs. The model also shows that greater visibility can reduce aggregate morality when saints are praised, but improve it when sinners are punished.

04Work in progressImage Concerns and Voting Order in Group Decisionswith Gábor Nyéki

Project summary

We study sequential public voting when group members care about appearing similar to others. In a three-member binary decision, one member may vote against her private preference to manage her social image. When population types are close to evenly split, this member is more likely to vote against her type when voting second than first. The ranking can reverse when one type is overwhelmingly common. These image concerns can make majority rule fail to select the option preferred by a majority and can make simultaneous voting worse than sequential voting.

05Draft availableThe Effect of Managers’ Health Shocks on Employment Practiceswith Kinga Marczell

Project summary

Using Hungarian linked employer–employee panel data and an event-study design combined with matching, we examine how managers’ illness episodes affect their employee pool. Employee separation rises by 8% after a manager’s health shock, driven mainly by dismissals rather than voluntary departures. Because the total number of employees does not change significantly, the pattern points to restructuring rather than downsizing. The findings reveal a consequential channel through which managers’ personal experiences can reshape workplace outcomes.

Open draft

Projects on hold

01
01Project on hold · Draft available on requestEffects of a Role Model Intervention on Students’ Aspirations, Motivation and Education Choiceswith Simone Haeckl and Zsuzsanna Vadle

Project note

This registered school-based randomized controlled trial investigates whether a role-model intervention can affect students’ aspirations, motivation, and education choices. The draft is available on request.

View AEA RCT Registry
Published inNature CitiesJEBOAmerican Journal of SociologyNature Human BehaviourPNAS

Publications

Peer-reviewed work

Behavioral experiments and large-scale comparative evidence on organizations and inequality.

Open a publication to read its abstract or copy a complete BibTeX record.

2026Rapid Earnings Growth in Finance Concentrates Top Earnings in a Few Large Citieswith Nils Neumann and the full author team · Nature Cities · Volume 3 · 447–457

Abstract

Since the 1980s, disproportionate top-earnings growth in large cities has renewed the spatial concentration of top earnings across the global north. We show that earnings growth in finance has concentrated top earnings in the small number of cities where financial-market jobs cluster. Using linked employer–employee administrative data for ten countries from 1989 to 2019, we find that the pattern extends beyond major global cities to smaller financial centres. Comparisons with similar domestic cities show that this contribution is not simply a byproduct of city size or urban growth, highlighting the role of sectoral specialization and the labour markets within those sectors.

Open article
2025Lengthy Waiting Corrupts, Especially When Unexpectedwith Linda Dezső and Yossef Tobol · Journal of Economic Behavior & Organization · Volume 232 · Article 106939

Abstract

Results of two studies demonstrate that long and unexpected waits adversely shape moral behavior. In Study 1, passengers who had just joined the check-in line at Ben Gurion Airport estimated their wait; after checking in, they privately rolled a die and reported an outcome, with higher reports yielding higher earnings. Wait duration was positively associated with lying. Study 2 experimentally varied both wait length and whether that duration was known in advance. Long waits caused more lying than short waits, and average lying was highest after long, unexpected waits. The findings suggest that people may seek compensation for long and unexpected waits by relaxing their morals in the monetary domain.

Open article
2024The Great Separation: Top Earner Segregation at Work in Advanced Capitalist Economieswith Olivier Godechot and the full author team · American Journal of Sociology · Volume 130(2) · 439–495

Abstract

Earnings segregation at work is an understudied topic despite the workplace being an everyday nexus for social mixing, cohesion, contact, claims-making, and resource exchange. Using linked employer–employee administrative panel data, we estimate the changing isolation of higher earners in 12 countries. In almost all countries, top earners have become more isolated from other employees, while their exposure to bottom earners has fallen dramatically. A first exploration indicates that deindustrialization, workplace downsizing and restructuring—including layoffs, outsourcing, offshoring, and subcontracting—and digitalization contribute substantially to this trend.

Open article
2023Within-job Gender Pay Inequality in 15 Countrieswith Andrew Penner and the full author team · Nature Human Behaviour · Volume 7 · 184–189

Abstract

Research on the gender pay gap has long suggested that men and women doing the same work for the same employer receive similar pay, with sorting into different jobs accounting for most of the gap. Yet data that identify comparable workers within the same employer are rare, and much of the evidence is decades old and limited to a few countries. Using recent linked employer–employee data from 15 countries, we show that sorting accounts for substantially less of gender pay differences than previously believed and that within-job pay differences remain consequential.

Open article
2020Rising Between-workplace Inequalities in High-income Countrieswith Donald Tomaskovic-Devey and the full author team · Proceedings of the National Academy of Sciences · Volume 117(17) · 9277–9283

Abstract

Earnings inequality has risen in many high-income countries, but the connections between that rise and workplace dynamics are less clear. We analyze more than two billion job-years nested within over 50 million workplace-years across 14 high-income countries. Although countries differ substantially in inequality levels and trends, the between-workplace share of wage inequality grows in almost every country and declines in none. Both earnings inequality and its between-workplace share are lower—and grow less strongly—where employment protections are stronger. The findings point to firm-level restructuring and widening wage differences between workplaces as central contributors to rising income inequality.

Open article

Research agenda

Three connected questions

01

Motivated beliefs & morality

How people construct beliefs that excuse self-interested behavior, and how narratives about others shape moral choices.

Excusing Beliefs about Third-party Success · Sinners and Saints
02

Choice & learning

How making a choice changes what people believe about selected and rejected alternatives—and how they process later evidence.

Informed Choice · Choice-induced Sticky Learning
03

Organizations & inequality

How inequality emerges within workplaces, and how consequential experiences affect managerial decisions and employee outcomes.

Managers’ Health Shocks · COIN collaborations

Profile

Experimental thinking, with a wider empirical lens.

I am a postdoctoral researcher at Masaryk University. Before moving to Brno, I was at WU Vienna. I earned my PhD in Economics, summa cum laude, from Central European University under Botond Kőszegi.

2025—Postdoc

Masaryk University

2019—2025Assistant Professor / Postdoc

Vienna University of Economics and Business

2019PhD in Economics

Central European University

ServiceReferee

Review of Economic Studies · JEEA · Management Science

Beyond research

The piano is where I keep listening, learning, and collaborating.

I play the piano as a long-term hobby, moving between classical music, chamber music, swing, and funk. I am a member of Klavierfreude Wien, a community of amateur pianists, and in 2025 I organized Brno Piano Day to bring musicians together across the two cities.