Argentina hits back at US ruling

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Argentina says American hedge funds' demands to renegotiate a debt restructuring amount to extortion. But the US Supreme Court has ruled in favour of the country's creditors. Can Argentina avoid another default? Plus, the bitter truth about chocolate: could we be heading for a shortage as cocoa farmers increasingly switch out of growing the crop? Also in the show, the world's rarest and most precious stamp goes on sale. We hear why the One-Cent Magenta could be worth as much as $20m. And, the hard facts about ready cash - we visit Britain's money factory.