► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />As investors prepared for this week's FOMC meetings, stock markets took a tumble. John Authers analyses how China's troubles have bred a broader fear of a global slowdown.<br /><br />► Authers’ Note: http://bit.ly/1Liu16x <br /><br />► FT Markets: http://bit.ly/1J5HNd3<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