In his book, Why Nations Fail, the renowned Harvard academic James Robinson argues a healthy democracy is key to a successful, functioning society.
He tells Stephen Sackur that even though financial elites are getting stronger and inequality is growing, democracy is still vibrant in America and that will enable the system to respond and correct the imbalances.
You can watch the full interview on BBC World News on Thursday, 12 July at 03.30, 08.30 15.30 and 20.30 GMT and on the BBC News Channel on Friday, 13 July at 04.30 BST.
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