Financial crisis explained (1/4): how did it happen?

Question 1 of 4: Rob Armstrong, Katie Martin and Martin Sandbu answer questions from the FT's Instagram followers: "If you were to explain to a layman, how did the financial crisis happen? Could it have been prevented?"► Subscribe to FT.com here: http://bit.ly/2GakujT► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubsFor more video content from the Financial Times, visit http://www.FT.com/videoTwitter https://twitter.com/ftvideoFacebook https://www.facebook.com/financialtimes