Signs indicating which road has right-of-way are common in Finland and some of the nearby countries. While it's been a few years since I've driven there, the last time I was in Helsinki, many traffic signals were turned off (as in dark) late at night or on weekends. They also had a number of intersections where there was no Stop or Yield/Give Way signs in any direction. Drivers were expected to know the rules of the road and who had right-of-way.
Sensible merchants would just use divisible-by-5 prices to avoid issues with rounding.
This doesn't always work. A common example where it doesn't work is grocery stores where certain items are sold by weight.
When I was in Australia in the '90s, they had already eliminated their coins smaller than 5 cents, and the common practice was to always round down cash transactions. So, if your total was $1.99 and you paid with cash, you'd only get charged $1.95. If you paid with EFTPOS (debit card) or a credit card, you'd be charged the full $1.99.
how does redundancy help you when the main power switch goes down / on fire and there is no one there
If you are a big enough operation, you have redundancy at the data center level. i.e. you can lose an entire data center and have no loss of service on your production applications. Other than a possible speed/performance degradation, your average customer has no knowledge that anything bad has happened.
This was tried, and rejected by the government in the past.
Requiring users to download and install some codec is probably a non-starter in both cases, though.
While it would be better if free codecs were included "out of the box", I wouldn't say it's a non-starter. There are an awful lot of systems out there where the user has chosen to install Flash. If major "trusted" web sites required WebM, Theora, etc., I would expect that most users would install the appropriate software to view that content, just as many users install Flash today.
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