Here are some good supply demand articles within the link below.
http://www.fool.com/investing/general/2012/08/23/your-crash-course-in-silver-supply-and-demand-.aspx
Here is a video if you don't have time for all the articles.
http://www.youtube.com/watch?v=M3uNsEfgZXY&feature=youtu.be
John
Edit: here is a good RT video on the monetary value of silver.