In France, the number of young start-ups has soared since the beginning of the 2010s, leading the government to encourage their development and make France the "start-up nation". This book contributes to a better understanding of the emergence of these companies by studying the influence of the ecosystem on their development and the modes of financing that they use. The financing of start-ups remains a major challenge insofar as they are often faced with refusal from the banks. Successful financing depends largely on the geopolitical and economic environment. Through a comparative study of models from both France and English-speaking countries, the authors explore possible financing solutions for France. The book concludes with a discussion of equity crowdfunding, which proves to be a successful financing alternative. Including theoretical and empirical studies, this book provides concrete solutions aimed at developing innovative entrepreneurship in France