The first volume of the book entitled 'Diversity of Business Development' was published in 2017 with the aim to present the diversity of research activities of the Institute for the Development of Enterprises at Corvinus University of Budapest. This fourth volume continues to take an interdisciplinary approach on the main areas of business development and provides publication possibilities for young and senior researchers. The authors of the book are István Csendes and Ákos Bocskor (strategic management), Erika Jáki and Béla Kádár (energy strategies), Attila Fiáth, Miklós Virág and Péter Takács (public transport), Nikolett Deutsch (sustainable system innovation), Ilona Hoffer and Viktória Katona (value management), Tibor Krisztián Csubák and János Ábrahám Ifkovics (cryptocurrencies).