AI Business LensTHE BUSINESS OF AI, FOR PEOPLE WHO TEACH IT OR LEARN FROM IT
Marginal Revolution · September 14, 2026

Does AI assistance enhance or erode expertise?

LawEconomicsIntellectual Property Law
THE AI ANGLE
boosting immediate drafting quality while producing divergent long-term skill retention based on prior expertise

In a randomized controlled trial of 133 patent attorneys across eleven firms, access to an AI drafting assistant boosted immediate task performance—particularly for junior lawyers—over a three-month period. However, subsequent testing of unassisted professional judgment revealed that lasting skill gains were concentrated entirely among senior practitioners, while junior lawyers experienced no average gain and a bifurcation in performance. These findings indicate that foundational expertise may be a prerequisite for converting AI assistance into durable professional human capital, challenging standard assumptions about legal training and productivity.

THE TEACHING ANGLE
Instructors can explore whether integrating AI into early legal coursework risks undermining foundational skill acquisition, given that durable judgment gains from AI practice accrued only to those with pre-existing senior expertise.

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