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Now Playing: 08-21-12 Marketplace Morning Report

Apple has hit a major milestone. The electronics giant is now the biggest public company ever measured by stock value. It's back to school shopping season and despite the weak economy, luxury retail has been doing well. And kids clothes are no exception. And an 11 mile stretch of the river has been closed because of low water levels. The Midwestern drought has hurt many companies that ship goods down the Mississippi. And that has many industries taking a closer look at where their water comes from.