The privatisation or marketisation of public services such as energy, water, trains, health, education, roads and prisons has enabled corporations to set up tollbooths in front of essential assets and charge rent, either to citizens or to government, for their use. Rent is another term for unearned income. When you pay an inflated price for a train ticket, only part of the fare compensates the operators for the money they spend on fuel, wages, rolling stock and other outlays. The rest reflects the fact that they have you over a barrel.