This book explores the dynamics of the informal business sector, offering diverse perspectives from researchers across BRICS+ nations and the Global South. Through its chapters, the book examines how the sector contributes to sustainable economic development, analyses the barriers it faces, and proposes innovative solutions to enhance its impact. © 2026 selection and editorial matter, Brian Ngwako Mokgatetswa Mahosi, Fulufhelo Godfrey Netswera, Ayanda Sibiya, Elton Fernandes, Sergei Smirnov and Shen Yi.