I think people in finances know of even more extreme example of calculator monopoly. My dad still uses HP-12C, a financial calculator made by HP in the 80s (ht

I think people in finances know of even more extreme example of calculator monopoly. My dad still uses HP-12C, a financial calculator made by HP in the 80s (http://en.wikipedia.org/wiki/HP-12C http://en.wikipedia.org/wiki/HP-12C). He's been using the same calculator for over 20 years. Extremely reliable and practical. It's no wonder people still get them.