A democratic republic affords
many avenues for organized private interests to influence public policy. The
fact that such interests are organized is enough to outweigh the influenced of
an organized constituency. Add in the money available to organized interests
and the imbalance is exaggerated. The military industrial complex—the “informal”
alliance between a military and private defense-contractors is a case in point
in the United States.
The full essay is at "Military Industrial Complex."