► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />The US oil price has fallen below $70 a barrel after Opec decided to maintain production levels. Anjli Raval discusses with Neil Hume if this is the start of a price war, a challenge to US shale producers or to do with internal cartel politics.<br /><br />► FT Markets: http://bit.ly/1J5HNd3<br /><br />► Lex: http://bit.ly/1I14JZF<br /><br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes
