Solid wastes management service is an essential public service,
which is non-exclusive and non-rivaled (Levine, 1995). Therefore it
is not feasible to exclude from service those who do not pay,
because public cleanliness and the safe disposal of wastes are
essential to the public health and environmental protection. Unfortunately,
solid wastes collection services of cities in developing
world generally serves a limited part of the urban population and
* Corresponding author. the inhabitants who are left out without solid wastes collection