There are some assets that are valuable in almost all situations, and which are coincidentally the most difficult class for governments, corporations, or even warlords to take from you:
* The ability to perform some sort of skilled labor. Preferably multiple sorts.
* Physical health.
* Strong relationships with friends, family, and neighbors.
* Mental fortitude and calmness.
* The knowledge and willingness to make do with limited resources.
Money cannot, of course, actually buy these things, but it can make their acquisition much quicker and easier. And it's never too early, or too late, to start. Collapse now, and avoid the rush!