In the past few years, a considerable number of immigrants have established their own businesses. In doing so, they have contributed in many ways to the economic development of American and European metropolitan areas. Some businesses have been incorporated into the mainstream, while others have stayed on the economic fringes and got engaged in the informal economy. The starting point of this book is that a proper understanding of these businesses is served by focusing on the embeddedness of immigrant businesses in their economic, politico-institutional and social environments from a multi-disciplinary perspective rather than confining the attention to ethnic-cultural or economic sociological aspects only.