"Human Action: A Treatise on Economics" is a work by the Austrian economist and philosopher Ludwig von Mises. It presents the case for laissez-faire capitalism based on praxeology, his method to understand the structure of human decision-making[^1]. The book is considered Mises' magnum opus[^1]. 

The book is divided into seven parts and 38 chapters[^2]. The first part deals with human action and its relation to economics. The second part deals with the action of man in society. The third part deals with economic calculation. The fourth part deals with interventionism. The fifth part deals with socialism. The sixth part deals with the problems of a socialist economy. The seventh part deals with the place of economics in society.

Here's a brief summary of each part of "Human Action"[^3]:

- Part One: Human Action
This part deals with human action and its relation to economics.

- Part Two: Action Within the Framework of Society
This part deals with the action of man in society.

- Part Three: Economic Calculation
This part deals with economic calculation.

- Part Four: Interventionism
This part deals with interventionism.

- Part Five: Socialism
This part deals with socialism.

- Part Six: The Hampered Market Economy
This part deals with the problems of a socialist economy.

- Part Seven: The Place of Economics in Society
This part deals with the place of economics in society.

I hope this helps! Let me know if you have any other questions.

[^1]: Human Action - Wikipedia. https://en.wikipedia.org/wiki/Human_Action
[^2]:  Human Action: A Chapter-by-Chapter Summary | Mises Institute. https://mises.org/library/human-action-chapter-chapter-summary
[^3]: Human Action: A Treatise on Economics - Mises Institute. https://mises.org/library/study-guide-human-action-treatise-economics
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