CONCEPT
Competitive Advantage
Porter's framework: sustainable above-average returns arise from positions defended by barriers to imitation — distinctive activities, fit among activities, and trade-offs that make copying costly.
Competitive advantage exists when a firm earns sustained returns above the industry average. Porter's analysis identified three sources: performing activities at lower cost than competitors (cost advantage), performing activities that create unique value buyers will pay a premium for (differentiation advantage), or achieving either within a focused scope. The advantage is sustainable only when protected by barriers to imitation — when competitors cannot easily replicate the source of advantage. These barriers arise from causal ambiguity (competitors cannot identify the sources), from fit among activities (replicating any subset produces no benefit), and from trade-offs (replication requires abandoning one's own position). The framework explains why operational improvements available to all firms produce no competitive advantage and why genuine strategy is rare.
In The You On AI Field Guide
The AI transition forces a fundamental question about the sources of competitive advantage: what remains difficult to replicate when execution becomes easy? Porter's framework provides the analytical structure for answering this. Execution activities — code generation, content production, design creation — are now