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Are commodity prices, including grain prices, too low? Is it right and fair for speculators to force them higher? That is the controversial view of David Hightower - President of The Hightower Report - which makes forecasts about shares and commodities. He debates the issue with Michael Masters, the head of Masters Capital Management, who argues that there is already excessive speculation in commodities and it should be restricted by legislation. Plus the ÃÛÑ¿´«Ã½'s Roland Buerk reports on how Japan is trying to breed more home grown sumo champions. And Lucy Kellaway reckons that the most popular cut any Western government could make, would be to cut Fridays and give everyone a four day working week.