Negative interest rates

Thanks to tutor2u for this
http://www.tutor2u.net/economics/blog/the-economics-of-negative-interest-rates?utm_medium=email&utm_campaign=Economics%20daily%20digest%20Thu%2025th%20February%202016&utm_content=Economics%20daily%20digest%20Thu%2025th%20February%202016+CID_b24c73bc6c27c7d9b9529e4ac9b21459&utm_source=CampMonitor&utm_term=The%20Economics%20of%20Negative%20Interest%20Rates%20In%20a%20growing%20number%20of%20countries%20central%20banks%20are%20resorting%20to%20cutting%20policy%20interest%20rates%20below%20zero%20per%20cent%20And%20bond%20yields%20in%20some%20nations%20are%20also%20negative%20Is%20this