► Subscribe to FT.com here: http://bit.ly/2r8RJzM<br /><br />While the Canadian dollar and two-year yield jumped after Bank of Canada’s rate rise, the Federal Reserve chairwoman’s careful approach weakened the US dollar Treasury yields. FT's Roger Blitz explains why investors are worried about QE retreat.<br /><br />► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br /><br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes