the premise is you can prepare anyway you want for either event or you can say either even just surprised you, let speculation run wild. with Zombie-like apocalypses can be anything last of us fungus, walking dead disease, or just a disease that wipes out 90-99% of the population and your one of survivors. With the economic downturn, The governments have collapsed in such a way as to make all currency completely useless and their rule can easily be challenged.
Zombies because of the premise that I’m one of the survivors; could find a nice isolated island live a decent off grid lifestyle. If I have time to prepare can even bring niceties like a bunch of raspberry pi’s and hardware and just chill out farming and playing games, developing software, writing, etc. Try to restart civilization.