Spent $187 Million 
Secretly 
Buying 1,600 Acres of Hawaii 
Land, And Now He Is Reportedly Building 
A Massive Self-Sustaining Apocalypse 
Bunker
https://www.yahoo.com/finance/news/mark-zuckerberg-spent-187-million-191118946.html
mmt of in early 2020 and all those CEOs were stepping down
Several notable executives have stepped down or announced that they're stepping down in 2020. In fact, January 2020 set a record for the most CEO departures in the US in one month — 219 in all.
https://www.businessinsider.com/bob-iger-keith-block-ceos-that-stepped-down-in-2020
Also the tech billionaires have been expecting something for a bit
https://observer.com/2019/10/luxury-bunkers-billionaires-apocalypse-nuclear-war
https://www.npr.org/transcripts/511507434
https://www.cnn.com/2020/07/15/business/bunkers-new-zealand-intl-hnk/index.html
Not that any of that was predictive programming, butt DAE member that intro to The Dawn of The Planet of The Apes(2014)
Links 
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yoi dont know that, nor to what extent and in what ways civilization will collapse when whatever happens happens.
need=/=want, and somethings that are wants are quite useful/helpful, like modern medicine and technology.
thats still war in the traditional sense. Not a mass cataclysm, zombie apocalypse or thermonuclear war.(each of which would themselves lead to drastically different outcomes).
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The most complex, wide-reaching chains would most likely be the first to break-down. That is a very uncontroversial take.
Enough medicine for a family isn't going to make someone rich, and medicine expires. A handful of technology in the bunker isn't going to be useful at scale and it can no longer be repaired.
They'd lead to an even more extreme versions of the same outcome as a regime collapse. In other words, if local rich people can't stay rich through a local regime collapse without an external system in which to store their wealth, then global rich people can't stay rich through a global collapse since the system on which their wealth depended (and where it was stored) will have collapsed, as well.
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most of it doesnt expire for 10-15 years
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040264
everything else you said is just more speculation
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Amoxicillin-Clavulanate was tested to 5 years in that study. From your link:
So between 19 and 109 months my EpiPen might not work. Playing Russian roulette during a severe allergic reaction sounds like a lot of fun.
lol
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I dont expect people with severe allergies and diabetus to survive.
90% of medications last 10-15 years. Most people dont need daily medications. Most medicines can be stock piled. Medicines would be highly valueable in a barter system.
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Most people need antibiotics and those last 5 years at most.
They can also be stolen at gunpoint from the soft-bodied techie that crawls out of his luxury bunker.
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What? Modern antibiotics and their overuse is at most a 100 year old phenomenon. Also:
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...antibiotics are the most useful medication to stockpile. What medications did you have in mind?
It's saying that they measured up to 15 years for some of those medications. Also from your link:
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The ones that dont expire so quickly, duh.
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You dont think they thought to have guns?
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One soft-bodied techie clumsily wielding his mall-ninja AR-15 against an armed squad of ex-Reservist marauders. Sounds like a good matchup.
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And thats when the cyborgs come in, remember the one's you thought were a dumb idea?
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