geez.. Its hard to pin this one down. I'll take my best wild assed guess at it...
There are some things which are true necessities, thing which are absolutely necessary for life. Water, air, food, warmth, shelter, medicines. I can see these things having lasting value, and increasing in value during times of scarcity.
There are some things that are luxuries. These things tend to go one of two ways. They either become worth very very little, or, in some rare cases, become quite valuable. Examples: TV's. Worth a fair bit now, but I strongly suspect that in an environment without power (and without programming) these will plummet in value. Same for the various prints and originals hanging on my walls, or the crystal and china in the cabinets. Our top-of-the-line Stickley furniture is worth a small fortune, but its likely firewood under most stressful conditions.
Other luxuries skyrocket in value. Cigarettes. Booze. Chocolate. Ever hear the stories about what a pair of silk stockings would get you in Europe during WWII?
I suspect the value of a particular luxury depends on the state of the economy (is is wartime-rationingin London type bad or is it we-are-starving-in Leningrad bad?). It would also depend on that item's ability to 'improve life". I'd argue that music can be a great comforter. However, I have great concerns about its usefullness. We are, by and large, not a population that really is into folk and bluegrass (I like em). Somebody picking on a guitar isn't necessarily going to dramatically comfort many people with far different musical tastes. Furthermore, the value of the guitar is largely depended on the players skill. My wife has a beautiful Gibson Lc-2 guitar with a gorgeous flame maple back, adirondack spruce top, great inlays and an unbelievable crisp, ringing tone that is simply amazing. We paid a lot of money for it. I know that the guitar is about item number 1432 on our list of items we "need" . In a stressed out economic situation I figure we'd be lucky to get 1/10th its value....
True luxury items are purchased by the affluent, or "collected" in times of prosperity. When prosperity ends the availble pool of people with excess cash(or other barter items) for luxuries is dramatically reduced. I cannot picture most musical instruments (luxuries) going up in value.
Fro