The Human Side of Investing: Behavioural Lessons from the Ultimatum Game

June 27, 2026 | By the Elystar Team

Traditional, or neoclassical, economics assumes that individuals make rational decisions. Investors are expected to evaluate alternatives objectively, maximize utility, and consistently act in their own economic self-interest.

Reality is often more complex. Investment decisions are influenced not only by logic and analysis, but also by emotions, cognitive biases, past experiences, and social influences. Investors do not make decisions in a vacuum. They interpret information through the lens of trust, fear, confidence, regret, fairness, and personal experience.

For affluent individuals and families, these behavioural forces can become even more significant. Wealth often represents far more than financial capital. It reflects years of effort, personal identity, family legacy, future aspirations, and the responsibility of stewardship across generations.

One of the most influential experiments illustrating human decision-making is the Ultimatum Game. Here is how it works.

One person receives ₹100 and decides how much to offer another person. The second person has only two choices:
  • Accept the offer, in which case both people receive the proposed amounts.
  • Reject the offer, in which case neither person receives anything.
Classical economics suggests that accepting even ₹1 is rational because ₹1 is better than ₹0. Yet decades of research show that very low offers are frequently rejected. Offers tend to become much more acceptable when the proposer shares roughly 30% or more of the amount. Below that level, many people reject the offer, even though rejection leaves both parties with nothing.

Why does this happen?

Because people do not maximize wealth alone. They also care about fairness, trust, reciprocity, dignity, and self-respect. This has important implications for financial markets. Every investment decision begins with people interpreting information through both logic and emotion. As a result, markets often respond not only to what a company earns, but also to how it treats its stakeholders.

When investors perceive unfairness—such as governance failures, breaches of trust, unexpected policy changes, excessive executive compensation, poor capital allocation, or actions that disadvantage minority shareholders—confidence can deteriorate rapidly, often leading to sharp declines in valuation.

The opposite is equally true. Companies that consistently deliver results beyond expectations, allocate capital prudently, communicate transparently, and treat shareholders fairly often earn something even more valuable than higher short-term profits: trust. Markets frequently reward such businesses with stronger investor confidence and higher valuation multiples because investors expect fair treatment to continue.

In many ways, the Ultimatum Game offers a useful analogy. A proposer who offers a fair share is far more likely to have the offer accepted and build cooperation. Similarly, companies that create value while sharing it fairly with shareholders, employees, customers, and other stakeholders are more likely to earn long-term confidence and sustained market support.

Financial markets are therefore driven not only by cash flows and valuation models, but also by expectations, trust, credibility, and perceptions of fairness.

For investors, the lesson is clear. Better decision-making requires more than financial analysis. It requires awareness of the emotional and cognitive forces that influence judgment.

By recognizing these behavioural forces, investors can make more deliberate choices, remain disciplined during periods of uncertainty, and better align their actions with their long-term financial goals. Because successful investing requires understanding not only businesses and markets, but also the people who participate in them—starting with ourselves.
 

Disclaimer: This content is intended solely for informational and educational purposes. It does not constitute investment, legal, tax, or financial advice, and should not be construed as a recommendation, offer, or solicitation to buy or sell any security or investment product. This is not an advertisement. While reasonable care has been taken to ensure the accuracy of the information presented, inadvertent errors or omissions may occur. Elystar Investment Management Private Limited shall not be liable for any loss or damage arising from the use of, or reliance on, this content. Past performance is not indicative of future results. Investments in the securities market are subject to market risks. Read all the related documents carefully before investing. Registration granted by SEBI, enlistment with BSE, and certification from NISM in no way guarantee performance of the intermediary or provide any assurance of returns to investors.

Copyright © 2026 Elystar Investment Management Private Limited. All rights reserved. No part of this publication may be reproduced, distributed, transmitted, published, stored, modified, or used, in whole or in part, without the prior written permission of Elystar Investment Management Private Limited.
 

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