In Hong Kong, flats really are cheaper when they contain the number 4
blog.dataguru.hk
blog.dataguru.hk
All of that because of a fantasy book where people had supper and they happen to be 13 at the table.
Edit: Here's an example: https://en.wikipedia.org/wiki/13_(number)#/media/File:Many_b...
Your link doesn't state that. It mentions the last supper as a potential but unlikely origin of 13 as an unlucky number.
https://www.seatguru.com/airlines/Qantas_Airways/Qantas_Airw...
Years ago they also had a pretty cool security demonstration in which they lighted up the emergency lighting.
Well, this fantasy book led to much more crazy behaviors. Beside this, the same is true for many other fantasy things like money or ethics.
[1]: https://en.wikipedia.org/wiki/HSBC_Building_(Hong_Kong)#Feng...
Floors:...11,12,15,16....33,35,36,37,38,39,50,51,52,53,55...
Units: 1,2,3,5,6,7...
But this doesn't really explain the difference in prices even for floor 44...
Thing is the number 9 sounds just like the word for dog, why doesn't that cause a problem?
As to 54, maybe you are referring to 勿死(wu4 si3)? Its meaning is closer to, please don't die, than not dying, and though I am not sure, but 勿 uses to negating another word seems kinda ancient and outdated.
Monty from xiph.org learned me that: https://xiph.org/video/vid2.shtml @ 5:57