For me this was essential viewing about the modern world, v1.00

Rating: 10/10 (27 September 2017)

Search for recent films with Selena Gomez and one finds such as this. She is only in them for a minute, a disappointingly short time, but in this the appearance is okay. She plays herself trying to explain one of the mechanisms behind the 2008 USA and worldwide financial disaster, and the setting for that example is the betting games at Las Vegas.
While that financial crash was happening I was too tied up by the UK Blair Witch period to be able to access news, so I only knew about the crash by prices starting to rise and supermarkets starting to move stuff around a lot, which as a way to put off supermarket customers seems effective, just I assume that it is done to advertise their stock range and to try to get more income? When UK Tory politicians blamed the crash on the previous Labour government I had no basis, other than suspicion, for questioning that.
The Big Short tells me things about the recent world and communicates better than a serious technical work would have done. I needed this.
'Citizenfour' (2014), does does the same about a period when I was starting to be able to access the news. It adds more detail about how the modern world works.
Look to the 2017 UK world, Brexit, these both help me to understand and appreciate that, though it would need additional features to give an explanation of how the left and right have gotten tied up by their equivalents of Blair Witch.
News in September 2015 of unusually high UK levels of unsecured debt due to poverty and Brexit suggesting that a financial crash might be imminent in the UK, it is The Big Short that supplies the alarm bells for that.