FDM sources
For the Negative Beta Post
http://aswathdamodaran.blogspot.com.es/2009/02/can-betas-be-negative-and-other-well.html
http://www.morningstar.in/posts/36419/can-beta-be-negative.aspx
https://www.sunshineprofits.com/gold-silver/dictionary/gold-interest-rates/
For the “4 problems calculating cost of debt” Post (D3Q1)