This book offers a unique framework to understand how public institutions and private investors can collaborate to sustain long-term investments (LTIs), with a specific focus on public private partnership for infrastructure, blended finance mechanisms, and impact investing.Offering a holistic approach to long-term investing, which encompasses both infrastructure and corporate innovation and sustainability strategies, chapters explore how collaborations can mobilize resources, overcome market failures, and maximize impacts. Furthermore, it provides a deeper understanding on LTIs, both in terms of the sustainable investment approaches that investors are progressively adopting, and in terms of the main domains of LTIs such as infrastructure and corporate investments in research and innovation, sustainability, and circularity. The book also highlights how LTIs are essential to ensure the achievement of the Sustainable Development Goals, which represent an institutionalization of the concept of public value.Public-Private Collaborations for Long-Term Investmentswill be critical reading for policymakers, investors, and managers working in the public and private sectors. The combination of cutting-edge insights and depth of knowledge rooted in the scientific literature will also be beneficial for scholars and students in the fields of public administration and management, infrastructure finance, and sustainability.