“The ‘Natural Interest Rate’ is always positive and cannot be negative”
The audio version of the Thorsten Polleit’s Mises Daily Institute article
narrated by Robert Hale, April 9, 2015  

Andy Duncan interviews Thorsten Polleit, 23 March 2013, Auburn, US Alabama
http://www.goldmoney.com/podcast/thorsten-polleit-on-the-gold-standard-that-never-wa s.html
http://www.youtube.com/watch?v=9dAUIDDhjnAIm Gespräch mit Frank Meyer, Metallwoche, über Staat und Freiheit, Januar 2013
http://www.metallwoche.de/thorsten-polleit-auf-der-metallwoche-uber-staat-und-freiheit/The Fiasco of Fiat Money
The audio version of the Thorsten Polleit’s Mises Daily article “The Fiasco of Fiat Money”, June 7, 2012, narrated by Harold Fritsche, music by Kevin MacLeod.
http://www.mises.org/media/7638/Audio-Mises-Daily-gtgt-The-Fiasco-of-Fiat-MoneyThe Euro Currency in the Light of the Progression Theorem
Symposium on the Centennial of ‘The Theory of Money and Credit’. Recorded 9 March 2012 at the Ludwig von Mises Institute in Auburn, Alabama.
http://www.mises.org/media/7401/The-Euro-Currency-in-the-Light-of-the-Progression-T heoremA priori’ Theory and the Sound Money Principle
Presented in Vienna, Austria, 20 September 2011. Includes an introduction by Douglas E. French.
http://www.mises.org/media/6669/A-priori-Theory-and-the-Sound-Money-PrincipleThere Will Be Hyper(Inflation)
The audio version of the Mises Daily “There Will Be Hyper(Inflation)” by Thorsten Polleit, April 2, 2009, narrated by Floy Lilley.
http://www.mises.org/media/3081/There-Will-Be-HyperInflation