The Walton family fortune fell $12.9 billion on Tuesday after Walmart Inc. slashed its earnings outlook for the second time this year. Shares of the Bentonville, Arkansas-based retailer, which is controlled by the family, tumbled as much as 9.1% in New York trading after it said adjusted earnings per share will decline as much as 13% this year with US shoppers reining in spending on big-ticket items amid soaring consumer prices. Two months ago, the company said earnings per share would only dip about 1%, while in February, it had predicted a modest increase. Read more: Walmart Tumbles Most in S&P 500 as Forecast ... (full story)