Budget decisions will typically have more than one impact. For example, if you select spend funds on a police car, you'll gain a police car, but this will take away funds from some other project, personnel expense, or piece of equipment. Negative externalities are included in such impacts. This is why careful planning is needed in all decision packages.
Auburn University explains it a bit further here: http://bit.ly/1w9eBpk
Whose input would be helpful to law enforcement as they set a budget, in order to avoid some of these externalities/
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