This article analyzes Public-Private Partnerships (PPPs) as institutional arrangements for economic coordination under uncertainty, in light of the Austrian School of Economics and the theory of the firm based on entrepreneurial judgment. It adopts qualitative theoretical-conceptual research, with an integrative review, institutional analysis, and praxeological interpretation. The theoretical results indicate that PPPs operate as hybrid structures that decentralize entrepreneurial judgment, mobilize organizational capabilities, and introduce partial forms of economic calculation, especially through project finance. It concludes that PPPs are second-best solutions, which mitigate, but do not eliminate, coordination problems, shifting the debate from contractual efficiency to coordination under uncertainty.