Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We assess theoretical predictions regarding the determinants of domestic intra-industry trade in large panel data of pairs of 276 cities, as well as 42 sectors, over three years in China. We find that geographical and technological distances are the main impediments of intra-industry trade, being more important than relative endowment differences. This confirms expectations based on new trade theory in a novel data environment.