CONCEPT
Stuck in the Middle
Porter's diagnosis of firms achieving neither cost leadership nor clear differentiation — earning below-average returns, a position AI has made untenable by universalizing execution cost parity.
A firm is stuck in the middle when it pursues neither cost leadership nor differentiation with sufficient commitment, attempting instead to compete adequately on both dimensions while excelling at neither. Porter argued that this position produces below-average returns because the firm lacks the clarity of purpose that would enable it to configure activities coherently. It cannot achieve the lowest costs because differentiation efforts increase expenses; it cannot command a premium because its offerings are not distinctive. In the pre-AI economy, the stuck-in-the-middle position was survivable if uncomfortable. AI has eliminated the middle ground entirely: when all firms achieve cost parity on execution through universal tool adoption, the only escape is differentiation through judgment.
In The You On AI Field Guide
The AI transition has moved every knowledge-work firm to the same cost position on execution activities — which means every firm has simultaneously achieved cost leadership in execution and no firm has achieved it in the strategic sense. The entire industry occupies execution cost parity. What Porter called