Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This paper develops a novel methodology to enhance the granularity of Inter-Country Input-Output (ICIO) tables, addressing well-known distortions caused by sectoral aggregation –distortions that are particularly pronounced for products with low substitutability, such as those essential to the green transition. Using this framework, we construct a disaggregated ICIO table that single out 129 products essential to the energy transition into eight green sectors, including electric batteries, vehicles, rare earths, and renewable energy equipment. We simulate East-West supply chain decoupling in green products through a multi-country, multi-sector trade model calibrated with such disaggregated ICIO table. Results reveal substantial economic costs: welfare losses reach 3 % and trade between blocs contracts by 20 %, even when accounting for trade diversion through neutral countries. We also quantify how green supply chain fragmentation increases greenhouse gas emissions intensities, showing that trade barriers on clean-energy sectors create dual risks, undermining both economic efficiency and climate objectives.