Gulomov, Kodir. “Contribution Margin, Dol, and Break-Even Analysis: A Financial Performance Comparison of Amazon and Walmart (2020–2024).”. GREEN ECONOMY AND DEVELOPMENT 3, no. 5 (May 1, 2025). Accessed April 2, 2026. https://yashil-iqtisodiyot-taraqqiyot.uz/journal/index.php/GED/article/view/5790.