Public-private partnerships (PPPs) are forms of cooperation between the public and private sector to supply the citizens with infrastructure and services which have traditionally been supplied by the public sector. PPPs are spreading all over the world. There is a growing pressure on the authorities to provide high quality services which are fundamental to the citizens’ basic needs. PPPs may represent a funding alternative that can make the use of public resources more efficient. However, in many countries the true driving force behind PPPs is not the aim to increase efficiency but the ability to bypass state expenditure controls and to move public investment off the state budget and debts off the government balance sheet.