The book "Knowledge as an Effective Tool to Improve Economic Performance" by Boris Herrera offers a comprehensive analysis of the role of knowledge in the economic performance of micro and small enterprises. It examines how the creation, use, and management of knowledge serve as crucial factors for the economic success of these businesses. Through a qualitative approach based on narrative methods, a theoretical framework is developed to understand the behavior of micro and small enterprises in the context of their economic performance. The book highlights the complexity of this sector and the necessary public policies that should be developed to support these businesses. Additionally, a thorough review of the theoretical contributions in the field of knowledge and knowledge management is conducted to define the available tools for improving economic performance. The empirical investigation of the book is divided into two phases, addressing the relevant variables and the type of knowledge used by small entrepreneurs.