Intermediate Goods and Weak Links in the Theory of Economic Development
Summary
Jones shows how intermediate-goods linkages multiply productivity effects and how complementarity makes production chains vulnerable to weak links: one poor input can sharply reduce total output. Written to explain cross-country income gaps, the framework later became a useful way to understand why automating many tasks may yield limited gains while a few essential tasks remain hard.
Why it matters
This is the clearest earlier foundation for the weak-link mechanism in Jones’s 2026 AI essay. It connects bottlenecks at the level of firms and production chains to aggregate productivity and growth.
What to keep in mind
The 2011 paper is about economic development and intermediate goods, not AI. Applying its mechanism to automated tasks is a later extension rather than a result directly tested here.