Amazon's eCommerce Flywheel Gathers Speed While Walmart Loses Ground

Core Insights - Amazon's share of U.S. retail spending increased by 7.6% in Q2 2025, more than doubling over the past six years, while Walmart's share has remained flat at 7 to 8% [1][14][15] - Amazon's U.S. retail sales grew by 9.5% year over year, significantly outpacing Walmart's 4.6% growth, indicating a structural shift in U.S. retail leadership [1][5][6] Amazon's Performance - Amazon's retail sales growth in Q2 2025 was driven by a 9.6% increase in eCommerce, leveraging its Prime membership, third-party marketplace, and logistics network [5][8] - Whole Foods, previously seen as a laggard, achieved a 7.5% growth, contributing to Amazon's overall performance [5] - The company's ecosystem maturity is reflected in its ability to reinforce customer loyalty and enhance selection and pricing through its Prime subscriptions and seller partnerships [8][14] Walmart's Performance - Walmart's growth of 4.6% in Q2 2025, while an improvement from Q1's 3.2%, remains less than half of Amazon's growth rate [6][7] - The traditional strategies of Walmart, such as lean inventory management and price leadership, are becoming less effective in a market increasingly defined by digital convenience [7][10] Competitive Dynamics - Amazon's continuous reinvestment in logistics, data-driven personalization, and customer-facing technologies keeps it ahead of competitors [10][11] - Walmart's initiatives, including acquisitions and investments in eCommerce and healthcare, have not yet shifted consumer perception significantly [11] - The grocery sector remains a stronghold for Walmart, holding a 21% market share compared to Amazon's 2.7%, but Amazon's investments in grocery indicate a strategic priority in this area [12] Consumer Behavior Trends - The share of consumer wallet is a critical measure of retail competition, with Amazon gaining ground as consumers increasingly allocate their spending to the platform [13][14] - Amazon's share of U.S. consumer retail spending has more than doubled over six years, reflecting its integration into daily life and consumer habits [14][15]