Public or government managed positions are a bit of an exception. For the sake of illustration, I'll make an attempt. Of course this is strictly hypothetical.

Public or government managed positions are a bit of an exception. For the sake of illustration, I'll make an attempt. Of course this is strictly hypothetical. The increased public safety from your experienced relative could create other opportunities in the city, such as a thriving retail sector. Whereas without that standard of public safety, shoplifting or other petty criminal activity might drive retailers away. You can claim that the overall demand for police officers would be one less in this scenario. However the demand for retail employment and the demand for those goods sold by retail shops might increase. Therefore, the overall size of the pie has increased. We can extrapolate a few levels from this point. A growing retail sector might necessitate further public or private security roles. Of course as with any example, there are probably several approaches to produce gotcha counter arguments. This is only meant to illustrate the larger point and not argue the specifics of the example.