According to Wayne F. Cascio in "Decency Means More than "Always Low Prices": A Comparison of Costco to Wal-Mart's Sam's Club," Costco was less profitable than Wal-Mart during the same five year period.

Question

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The statement is incorrect. Cascio notes that although Costco's profit margins were lower than Wal-Mart's Sam's Club in some years, overall Costco was more profitable than Sam's Club during the same five year period.