FastFT's Katie Martin highlights the key stories to watch for in the markets on Friday, including US Federal Reserve chair Janet Yellen speaking at the Jackson Hole symposium and economic indicators out from Japan<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 />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes
