► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />The search for higher yields has sent many investors to junk bonds, co-cos, emerging market debt and munis. John Authers, the FT's senior investment columnist, examines the risks involved.<br /><br />► FT Wealth: http://bit.ly/1e3996C<br /><br />► FT Business: http://bit.ly/1KUK08s<br /><br />► Bond Turmoil: http://bit.ly/1JUa4Dy