• Walmart average gross margin for 2011-10-31 was 0%, a 0% decline from 2012-01-31.
• Walmart average gross margin for 2012-01-31 was 0%, a 0% decline from 2012-04-30.
• Walmart average gross margin for 2012-04-30 was 0%, a 0% decline from 2012-07-31.

Gross margin can be defined as a company's total sales revenue minus its cost of goods sold, divided by the total sales revenue, expressed as a percentage.