Which concept does the author use to argue for the rights of the people?

The question is quite general and doesn't specify the context or content of the author's argument. However, if the author is arguing for the rights of the people, common concepts or principles used in such arguments include:

1. Human Rights: The concept that individuals are entitled to certain fundamental rights and freedoms simply by virtue of being human.
2. Equality: The idea that all individuals should have equal rights and opportunities without discrimination.
3. Justice: The concept of fair and equitable treatment for all members of society, often tied to the protection of rights.
4. Democracy: Emphasizing the importance of a government that is accountable to the people and protects their rights.
5. Liberty: Advocating for the freedom of individuals to make choices and live their lives without unwarranted interference.

The specific concept used by the author would depend on the context and the nature of the argument being made.