• Costco average operating margin for 2023 was 3.37%, a 2.6% increase from 2022.
• Costco average operating margin for 2022 was 3.46%, a 2.06% decline from 2021.
• Costco average operating margin for 2021 was 3.39%, a 5.94% increase from 2020.

Operating margin can be defined as operating margin measurement of what proportion of a company's revenue is left over after paying for variable costs of production such as wages, raw materials, etc.