An interesting piece on incarceration and the token economy,
Because prisons are, in a sense, enclosed environments they represent somewhat of a behavioural laboratory where contingencies can be altered and controlled on a large scale. Few other settings allow for such systemic control of influencing variables.
Within prisons, inmates need to maintain some income in order to obtain many necessities and comforts. Altering the economy to a Token Economy and making these necessities and comforts contingent on engagement in skills learning or good behaviour could vastly improve behaviour in a prison system.
Additionally, since these environments are so highly controlled that access to social and recreational contact all must pass through the system – engagement in these things might be used to motivate good behaviour as well.