The fortune of the world's richest family tumbled by $US11.4 billion ($16.4 billion) after US retail giant Walmart cut its earnings forecast for the second time this year.Shares of the retailer, which is controlled by the Walton family, fell by 7.6 per cent in US trading on Tuesday (Wednesday AEST) after it said adjusted earnings per share will decline as much as 13 per cent this year, Bloomberg reports.Shares in Walmart, the biggest US retail company, closed 7.6 per cent lower.
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