Book excerpt: This book examines Public–Private Partnerships (PPP), and tracks the movement from early technical optimism to the reality of PPP as a phenomenon in the political economy. Today's economic turbulence sees many PPP assumptions changed: what contracts can achieve, who bears the real risks, where governments get advice and who invests. As the gap between infrastructure needs and available financing widens, governments and businesses both must seek new ways to make contemporary PPP approaches work.