“…3: chemicals (24), leather products (19), machinery (29, 30, 31), metals (27, 28), minerals (26), textiles and clothing (17, 18), transport equipment (34, 35) and wood products (20, 36). These aggregates can be further grouped in four groups distinguished by degree of economies of scale as in Pratten (1988) and skill intensity as in Baldwin et al. (2000): Chemicals, Machinery and Transport Equipment are high‐scale economies and high skill‐intensive, Metals are high‐scale economies and low skill‐intensive, Leather & Footwear, Minerals and Textiles & Clothing are low‐scale economies and low skill‐intensive, and Wood Products are low‐scale economies and high skill‐intensive.…”