In pursuit of profit, private companies may also worsen environmental conditions and raise risks to the health of the poor. Proposed solutions for improving service delivery must include input from, and meet the needs of, those the system will serve. Community water systems, for example, must be financially viable for the supplier but also must not exclude the poor who may not be able to pay full recovery-cost prices. Poor people's rights to access basic services must be ensured, even in a competitive, free-market world, and government agencies, civic groups, and the private sector should work together to design and implement effective, sustainable systems. Nongovernmental organizations can play an especially im-portant role as facilitators among these groups, providing technical capacity, or knowledge of other experiences, when needed.
People rely on social networks to create opportunities or manage risk.
In an urban setting, increased mobility leads to weak social cohesion and fewer opportunities for establishing a sense of community. Individual- level social capital based primarily on an ability to reciprocate becomes the backbone of these new urban networks. With so little to give, the destitute may soon be left out of these networks. Negative forms of social capital can arise, with organized crime providing a system of protection and assistance for many. The resulting crime and violence can seriously restrict mobility for social interaction, eroding the space for developing trust and cooperation in the community even further.