I recently reiterated that there is no ROI for security (except for Road House) This is obviously not true for all technology. Think of the effect of deploying radios in taxis. Before this invention, cabs relied on getting assignments through a central dispatcher at their home station. A cab that only ran two dozen passengers per shift can accommodate double that number, hardly ever returning back to base. That’s called an increase in productivity — the source of real economic growth — and real ROI.”]
Source: https://taosecurity.blogspot.com/2006/08/real-technology-roi.html