[NhanH]

Strictly speaking, pour all your resources into preventing the collapse is the best choice (with the usual prisoner dilemma applying). No kind of investing will survive a society collapse. Money is a mean to delay your own consumption. And once society collapses, a lot of consumables are just lost.

That goes to the next rational action: spend like there is no tomorrow, adjusted for risk of society not-collapsing? Pick your poison, I guess.