“Humans act” is an a priori statement, which is the foundation of the inductive reasoning behind praxeology. It is a statement that describes an undeniable fact. A rejection of this statement is itself an action, therefore, proving the truthfulness of the statement.

This statement is where Human Action by Mises starts its dicussion of economics in the lens of Austrian economics.

However, the statement can be used as a tautology for explorations outside economics. For example, it is where I started with my discussion on the necessity for a life management system.

References

Mises, L. V. (2012). Human Action: A Treatise on Economics. Martino Fine Books.