This book argues that institutional investors would better serve their long-term goals by putting money into large-scale, future-facing projects such as infrastructure, green energy, innovation in agriculture, and real estate development. At the same time, redirecting long-term investments would close significant financial gaps that government cannot. Drawing on key contributions in economic sociology, social network theory, and economics, the book conceptualizes a collaborative model of investment that is already becoming increasingly common: Large investors contribute more directly to private market assets, while financial intermediaries seek to foster co-investment partnerships, better aligning incentives for all. A combination of rich case studies and rigorous theory enables asset owners to move toward more efficient, private-market investing, while also laying groundwork for research at the frontier of finance.