Gold as a long term, SHTF, investment comes up in a number of threads, so rather than seek those out individually.....
This is from today's ChartR. Admittedly the respondents probably weren't thinking of EOTWAWKI, but I think it's applicable as well. My feeling about a societal collapse is that with all financial investments being worthless, you can only store so many emergency rations, but land would be the long term savior to use for agriculture.