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Banks and hedge funds in London are coming under increasing scrutiny over their practice of speculating on food prices.

The allegation is that financial institutions are buying up vast stocks of food, thereby forcing prices to rise.

This comes as food costs are increasing the world over. And as the revolt in Tunisia and other countries has shown, there is a social price to pay for this kind of rise.

Al Jazeera's Laurence Lee reports.

Source: Al Jazeera