Long ago, I had heard that financial systems were running on old systems. ... I friend of mine, working for a major airline about ten years ago, told me that the airline ticketing system they were using was written in cobol. But that they were in the process of porting it over to something newer. I guess that when you spend time and money setting something up, it is difficult, and costly to upgrade.
Just like the power distribution system. The one we're using has been in use for about 150 years. There are better ways of doing it, but the cost to switch would be large, and the will to upgrade is poor.
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