This only works if you exclude the entirety of commodity and stock exchange business, which runs almost completely on off-the-shelf hardware. I'd say this is a

This only works if you exclude the entirety of commodity and stock exchange business, which runs almost completely on off-the-shelf hardware. I'd say this is a pretty big part of western civilization. Of course, the I/O requirements of these systems massively eclipse that of "puny" banks, logistics/distribution, manufacturing, and insurance companies.