The gap comes down to timing and asset class. Carnegie built his fortune during the explosive industrial consolidation of the 1870s-1890s, when he could control 30% of America's steel output and command pricing power. But he *sold* Carnegie Steel to J.P. Morgan in 1901 for $480 million (roughly $16B today), effectively cashing out at peak. Marshall Field, by contrast, never sold—he held his department store empire until death in 1906, and his fortune was frozen in real estate and retail assets that appreciated but couldn't be liquidated at scale. Carnegie's $372M "official" net worth is actually a snapshot from before his biggest payoff; Field's $140M (the $6.8B adjusted figure) represents his total estate, apples-to-apples.

The real reason Field looks wealthier on paper: he was a pure retailer sitting on Manhattan real estate and inventory, while Carnegie had already monetized his empire. A $480M steel sale in 1901 dollars would dwarf Field's retail holdings, but historians quoted Carnegie's net worth at different points in his life. Field never had the opportunity to sell his business for a comparable premium—the department store model was less attractive to institutional buyers than a consolidated steel manufacturer.

Carnegie's legacy also benefited from aggressive wealth-building in the highest-margin industry of the era, while Field diversified into real estate and consumer goods. If Field had liquidated at peak retail dominance around 1900, he probably would've matched or exceeded Carnegie. Instead, he held assets that appreciated steadily but unglamorously, making his fortune *look* bigger in inflation-adjusted dollars while being harder to convert to cold cash—a reminder that net worth on paper and liquid wealth tell very different stories.