In a development crisis context in which the Least Developed Countries (LDCs) have been trapped since their independence, and the persistence, or even the continued expansion of the informal economy, boosting micro enterprises (MSMEs) becomes a key issue to SMEs to create dynamic and inclusive economic development. Based on a survey of urban micro-manufacturing companies, this book provides new knowledge on the existence and reality of the informal economy, the logic of micro-enterprise operation and draws a typology of MSMEs into two groups according to their operating modes, the size of the investment and the nature of labor: subsistence enterprises and commercial enterprises. It offers a set of policies to rethink the conditions of dynamic transition of MSMEs to SMEs. The core of these policies is to enable companies to generate and accumulate value added. The book will be useful both for researchers and policy makers in the definition of microenterprises boosting policies and creating SMEs.