[Book Review] The Absolute Law of "Organization and Number of People": The Amazing Power of "Dunbar's Number" That Governs Human Relationships

The astonishing science that approaches the essence of human relationships: The hidden laws of human society revealed by evolutionary psychology.

By thoroughly unraveling the essence of organizational management and human relationships in modern society from the perspective of evolutionary psychology, this book vividly depicts the depth and surprising constraints of our social instincts.

The author scientifically analyzes the structure and function of human groups through the mechanisms of the social brain formed during the process of human evolution.

The central concept is what is known as "Dunbar's Number," the upper limit of the number of people with whom a human can maintain meaningful social relationships.

Surprisingly, this number is 150 on average.

This number is not merely a statistical value, but indicates an amazing social adaptation mechanism created by human evolution.

Because our brains have adapted over tens of thousands of years of the hunter-gatherer era, they are optimized for a social environment fundamentally different from large-scale modern society.

This book stratifies human social networks into specific numbers—5, 15, 50, and 150—and explains in detail how each layer functions and interacts.

The circle of the 5 most intimate people, the group of 15 friends, the network of 50 good relationships, and the overall social network of 150.

These layers are not just numbers, but represent the essential structure of our social existence.

From the perspective of organizational theory, this book serves as a fundamental challenge to conventional hierarchical organizational management models.

Large-scale organizations are actually built against the essential social capabilities of humans, and it reveals the root causes of the resulting inefficiency, fragmentation, and stress.

Particularly impressive are the three principles for maintaining the quality of human relationships.

First, that the size of the group determines its health.

Second, that the quality of mutual relationships declines as the size of the group increases.

Third, the importance of the stress hormone cortisol and endorphins, which provide a sense of security.

These principles are not just theoretical concepts, but strike at the core of our social survival strategies.

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My thoughts after reading this book

Upon finishing this book, I was overwhelmed by the complexity of human society and, at the same time, its surprisingly simple principles.

We are under the illusion that we are constantly living in large-scale, complex organizations, but in reality, we possess social brains optimized for hunter-gatherer societies from tens of thousands of years ago.

The most shocking part was the social significance of the number 150.

Once this boundary is crossed, human relationships transform into transactional ones, and mutual trust is rapidly lost.

This book eloquently tells us that modern large corporations and massive organizations are, in fact, nothing more than artificial structures that go against the essential social capabilities of humans.

The implications for leaders are also extremely important.

Growing an organization does not simply mean increasing the number of people; it means expanding carefully while maintaining the quality of human relationships.

Being conscious of the layers of 5, 15, 50, and 150 people, and understanding the characteristics of each layer, is the key to effective organizational management.

Who I especially recommend this book to

• Organizational leaders and business managers

• Professionals involved in HR and organizational development

• Executives of startups and small to medium-sized enterprises

• Managers interested in team building

• Researchers interested in evolutionary psychology and human behavior

• Community managers and social designers

Recommended books to read alongside this one

• Corruptible: Who Gets Power and How It Changes Us by Brian Klaas and one other

• Why Psychological Safety in Organizations Does Not Increase by Masanobu Kagawa

• The Future of Organizations Is Determined by Engagement by Yoshihide Nii and one other

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Summary of this book

Human social ability is a delicate and limited mechanism formed over tens of thousands of years of evolution.

Our social brain is optimized for small-scale hunter-gatherer societies and is designed to function in environments fundamentally different from modern large-scale organizations.

The layered structure of social networks, centered on Dunbar's number, indicates the essential constraints of human relationships, and organizations must constantly be aware of the limits of individual social capacity.

The essence of effective organizational management is not merely expanding numbers, but maintaining high-quality human relationships.

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#EvolutionaryPsychology #OrganizationalTheory #DunbarsNumber #TeamBuilding #Leadership #HumanRelationships #SocialBrain #OrganizationalDevelopment #ManagementStrategy #Community