Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We provide evidence showing that the degree of diversification of import sources of finely disaggregated commodities rises monotonically along the growth path. This result is robust to different measures of import diversification and the inclusion of a large set of additional control variables. In addition, we show the process of rising import diversification takes place as countries gradually increase their spending shares in imports originating from relatively distant exporters.