Which innovative retail strategy did Walmart introduce in 1988 that revolutionized the American grocery landscape and eventually made them the largest food retailer in the US?

Retail giants have dramatically transformed the food industry landscape over the decades. While many large corporations have ventured into grocery sales, some have implemented innovative strategies that changed how Americans shop for food. This trivia focuses on a significant retail strategy that revolutionized food distribution and pricing in the United States, making grocery items more accessible to millions of consumers nationwide.

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The Supercenter concept, combining full grocery stores with general merchandise
The 'Fresh Food Marketplace' that emphasized organic and locally-sourced produce
The 'Value Meal' subscription service delivering prepared foods to homes
The 'Neighborhood Market' small-format urban grocery stores