Oliver Stone has revealed that he found it difficult to research for Wall Street: Money Never Sleeps.
Stone is back in the director's chair to follows up his 1987 movie as Michael Douglas returns to the role of Gordon Gekko, the role that brought him a Best Actor Oscar.
And while Stone has brought together an impressive cast of Shia LaBeouf, Carey Mulligan and Josh Brolin it was the research for the movie that the filmmaker found the most difficult aspect of the film.
Speaking to the New Statesman he said: "It was extremely difficult to go back to the subject matter because the new markets of the 2000s were much more complex than the 1980s 'Wall Street' that I knew a bit about.
"Along with my writers, Allan Loeb and Stephen Schiff, I had to do a lot of research into the new workings of these exotic securities that could be lumped under the name of "derivatives".
"Perhaps the toughest aspect of making this film was combining the financial complexity with the need for a driving, tense narrative that would carry through the film."
It's the second movie of 2010 for the filmmaker after his documentary South of the Boarder earlier this year. He is also set to direct project Memphis, a movie that will be set in the fifties.
Wall Street: Money Never Sleeps is out now.
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