Arun Motianey, director of fixed income strategy at Roubini Global Economics, says the global economy is at risk of collapsing inward unless policy makers address the threat of inflation and exchange rate inflexibility.
For Professor David Harvey, Marxist author of The Enigma of Capital, the collapse of capitalism is inevitable. He tells Sarah Montague that capitalism is amoral, lawless, and it should be overthrown.
You can watch the full interview on Thursday 19 August 2010 on BBC World News at 0330, 0830, 1530, 2030 GMT and on the BBC News Channel on Friday 20 August at 0230 and 0430 BST.
This programme was first broadcast on Wednesday 5 May 2010.