1.
Incentives drive outcomes. Lampert enriched his hedge fund, not the business — $200M/year in interest to himself while stores rotted.
2.
You can't manage retail from spreadsheets. Lampert never visited stores, missed leaky roofs and empty aisles that customers saw daily.
3.
Disrupting yourself beats being disrupted. Sears nailed the catalog-to-retail shift in the 1920s, then abandoned catalogs in 1993 — right before e-commerce.