I thought about buying gold and silver but I have to wonder if that is a good idea. It seems to me that one of the primary uses of gold and silver is jewelry. If the economy goes into depression the demand on jewelry would drop greatly and thus the value of those two metals would also drop. Their price seems to be to elastic to me. Copper on the other hand might be good depending on how elastic/inelastic the demand is on that metal.
Maybe the best thing for us to invest in is canned goods and a storage closet