► Read more at https://on.ft.com/2zLw8QC<br /><br />Oil prices have tumbled after reaching four-year highs in October, raising fears of a new downturn. The FT's Anjli Raval explains what's driving recent volatility in the oil price.<br /><br />► Subscribe to FT.com here: http://bit.ly/2GakujT<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
