I collect silver bullion coins and silver coins in general. I think silver is a good buy right now and would be very good in say a ROTH IRA. If silver goes back to the level it was at in early 2011 it would go from about $18 an ounce now to close to $40 an ounce. Historically silver has been a 1/16 of gold meaning silver should be trading at about $75 an ounce. I don't think it will go that high anytime soon but it is a possibility.
If by "invest", you mean as a hedge against an economic collapse where paper money is no longer of value then my answer is, yes. A modest amount for this purpose is a good idea. (If the Ebola virus mutates to become airborne then a true world-wide economic collapse may occur soon. Keep your eye on the news.)
If you mean to invest so your money can grow then, no. It is not a good idea to buy silver.
On the average, the price of precious metals keeps pace with inflation. That is better than burying your money in the back yard, but not by much.
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good thanks