Here is a thought experiment for our age.
You wake up to find your fairy godmother has overachieved: you're a new you, in a physically attractive, healthy body with no ailments and no older than 25 (giving you a reasonable propect of living to see the year 2100: making it to 2059 is pretty much a dead certainty).
The new you is also fabulously wealthy: you are the beneficial owner of a gigantic share portfolio which, your wealth management team assures you, is worth on the order of $100Bn, and sufficiently stable that even Trump's worst rage-tweeting never causes you to lose more than half a billion or so: even a repeat of the 2008 crisis will only cost you half an Apollo program.
Finally, you're outside the public eye. While your fellow multi-billionaires know you, your photo doesn't regularly appear in HELLO! magazine or Private Eye: you can walk the streets of Manhattan in reasonable safety without a bodyguard, if you so desire.
Now read on below the cut for the small print.
Maslow's hierarchy of needs takes on a whole new appearance from this angle.
Firstly: anthropogenic climate change will personally affect you in the years to come. (It may be the biggest threat to your survival.)
Secondly: the tensions generated by late-stage capitalism and rampant nationalist populism also affect you personally, insofar as billionaires as a class are getting the blame for all the world's ills whether or not they personally did anything blameworthy.
Let's add some more constraints.
Your wealth grows by 1% per annum, compounded, in the absence of Global Financial Crises.
Currently there is a 10% probability of another Global Financial Crisis in the next year, which will cut your wealth by 30%. For each year in which there is no GFC, the probability of a GFC in the next year rises by 2%. (So in a decade's time, if there's been no GFC, the probability is pushing 30%.) After a GFC the probability of a crash in the next yeear resets to 0% (before beginning to grow again after 5 years, as before). Meanwhile, your portfolio will recover at 2% per annum until it reaches its previous level, (or there's another GFC).
You can spend up to 1% of your portfolio per year on whatever you like, without consequences for the rest of the portfolio. Above that, for every additional dollar you liquidate, your investments lose another dollar. (Same recovery rules as for a GFC apply. If you try to liquidate all $100Bn overnight, you get at most $51Bn.)
(Note: I haven't made a spreadsheet model of this yet. Probably an omission one of you will address ...)
The head on a stick rule: in any year when your net wealth exceeds $5Bn, there is a 1% chance of a violent revolution that you cannot escape, and end up with your head on a stick. If there are two or more GFCs within a 10 year period, the probability of a revolution in the next year goes up to 2% per year. A third GFC doubles the probability of revolution, and so on: four GFCs within 40 years mean an 8% probability you'll be murdered.
Note: the planetary GNP is $75Tn or so. You're rich, but you're three orders of magnitude smaller than the global economy. You can't afford to go King Knut. You can't even afford to buy any one of Boeing, Airbus, BP, Shell, Exxon, Apple, IBM, Microsoft, or Google. Forget buying New Zealand: the annual GDP of even a relatively small island nation is around double your total capital, and you can't afford the mortgage. $100Bn does not make you omnipotent.
What is your optimum survival strategy?
Stuff I'm going to suggest is a really bad idea:
Paying Elon to build you a bolt-hole on Mars. Sure you can afford it within the next 20 years (if you live that long), but you will end up spending 75% of your extended life expectancy staring at the interior walls of a converted stainless steel fuel tank.
Paying faceless realtors to build you a bolt-hole in New Zealand. Sure you can afford a fully staffed bunker and a crew of gun-toting minions wearing collar bombs, but you will end up spending 75% of your extended life expectancy under house arrest, wondering when one of the minions is going to crack and decide torturing you to death is worth losing his head. And that's assuming the locals don't get irritated enough to pump carbon monoxide into your ventillation ducts.
Paying the US government to give you privileged status and carry on business as usual. Guillotines, tumbrils, you know the drill.
So it boils down to ... what is the best use of $100Bn over 80 years to mitigate the crisis situation we find ourselves in? (Your end goal should be to live to a ripe old age and die in bed, surrounded by your friends and family.)