With Roundy's buying seven Kohl's in the Milwaukee area, there is concern that Roundy's dominance of that market could lead to higher prices. But consumers stayed happy when a similar situation happened at H.E. Butt Grocery in San Antonio. One possible reason for this is the so-called "Wal-Mart effect," meaning that the presence of Wal-Mart Supercenters forces grocery stores to keep their prices low in order to compete.
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