Stocks are lower at midday after Goldman Sachs lowered its U.S. GDP forecasts, reversing early gains on better jobs and retail sales data. Concerns around Chinese growth continue to plague investors, who are reassessing their view of the world's second-largest economy amid worries around problem loans and export demand. Tensions in the Ukraine are adding to uncertainty ahead of a weekend vote on whether the Crimea should join Russia. TheStreet's Jane Searle speaks with Ben Willis at the NYSE.

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