Rockefeller's wealth was a snapshot frozen in 1913—a control premium on a single industry at the exact moment the U.S. economy was smaller and oil refining was the only game in town. His $90M annual revenue sounds massive until you realize it was concentrated in one extractive business with thin margins. Once the Sherman Act broke up Standard Oil in 1911, his wealth was partially trapped in a fragmented competitive landscape. He got rich owning molecules; Walton got rich owning velocity.

Walton's genius was understanding that in a consumer economy, the spread between wholesale and retail is infinite if you eliminate friction. Walmart's 1960-1990 expansion created a network effect—more stores meant better supplier leverage, lower costs, higher volume, repeat infinitely. His $27.6B in 1992 was compounding machine wealth, not a monopoly rent extraction. That money wasn't threatened by antitrust because it looked like "efficient markets" rather than "illegal cartels." Inflation adjustment reveals the real difference: Rockefeller was buying oil fields; Walton was buying behavioral change at scale.

The 726x gap also reflects economic growth itself. In 1913, the entire U.S. GDP was roughly $40B. Walmart's annual revenue alone hit $469B by 2020—over 11x the entire economy Rockefeller dominated. Walton's heirs didn't just inherit wealth; they inherited a company whose competitive moat only strengthens with time, digital integration, and scale. Rockefeller's monopoly was legally dismantled; Walmart's monopoly is invisible because it masquerades as low prices and consumer welfare.