• Wayfair average gross margin for 2013-06-30 was 0%, a 0% decline from 2013-09-30.
• Wayfair average gross margin for 2013-09-30 was 0%, a 0% decline from 2013-12-31.
• Wayfair average gross margin for 2013-12-31 was 0%, a 0% decline from 2014-03-31.

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.