Characteristics
A public service may sometimes have the characteristics of a public good (being non-rivalrous and non-excludable), but most are services which may (according to prevailing social norms) be under-provided by the market. In most cases public services are services, i.e. they do not involve manufacturing of goods. They may be provided by local or national monopolies, especially in sectors which are natural monopolies.
They may involve outputs that are hard to attribute to specific individual effort and/or hard to measure in terms of key characteristics such as quality. They often require high levels of training and education. They may attract people with a public service ethos who wish to give something to the wider public or community through their work.
Read more about this topic: Public Services