Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

If our economy crashes, and cash is worthless, should i buy gold or silver 
Neither. Food, fuel, and tools. Books on how to make and use basic tools -- the books published for farmers who want to kluge their own solutions might be helpful. Heck, help defend a library; it will be beyond price as soon as things settle out a bit. Having skills like blacksmithing and knowing how to teach could go a long way. SF really has explored this in better detail than we could possibly cover here.