When I was young I would collect different currencies. Today I purchased daily essentials from old currency which are still accepted in the economy because I know the world economy is in serious trouble so after sometime old currency will be worthless (not accepted). I am thinking many billions of old currency will be released into world economy because of serious world problems. World people will sell ancient gold and silver and the price will fall to some extent. People have gold which had been purchased at $10 per ounce.