Here's the thing: the comparison is apples-to-oil because these fortunes were measured at different moments in history with wildly different methodologies. Rockefeller's $340M figure is already inflation-adjusted to modern dollars, while Eastman's $1.45B sounds massive until you realize it represents peak *company valuation*, not his personal net worth—a crucial distinction the numbers obscure. Eastman's actual personal wealth at death was closer to $75-100M in nominal dollars (roughly $2-3B adjusted), which is real money but not Rockefeller-level dominance. The sleight of hand here is comparing one guy's adjusted personal fortune against another's company valuation.

What explains the original wealth gap is market structure and leverage. Rockefeller didn't just sell oil—he *owned* the refining infrastructure that processed 90% of America's crude. That's vertical integration on steroids, creating compounding monopoly rents that grew faster than the broader economy. Every competitor, every factory, every industrial nation needed him. Eastman, meanwhile, was brilliant at democratization and distribution, but photography was inherently more competitive; other camera makers emerged, film formats proliferated, and his genius was making the category bigger rather than owning it outright. Standard Oil was a chokehold; Kodak was a preferred supplier.

The real winner here depends on your definition of "mogul." Rockefeller created passive, monopoly-driven wealth that snowballed across decades—his remaining Standard Oil shares made him richer *after* the 1911 breakup. Eastman created *innovative* wealth by solving a real problem (making cameras accessible) and building a brand that mattered, but his fortune was more exposed to competition and technological disruption. By today's standards, Rockefeller's play was more ruthless and more rewarding; Eastman's was more visionary but ultimately more vulnerable. Choose your oligarchy carefully.