Gross Imports versus Re-imports in UN COMTRADE
In addition to gross imports, UNSD recently introduced re-imports as trade flow. Re-imports is included in gross imports.
Note: in case your UN COMTRADE quick queries return trade values when the selected reporter is the same as the partner (China-China for example), what is returns by WITS is re-imports. If re-imports is not reported by a country, such query should return an empty table.
Next: Gross Exports versus Re-exports in UN COMTRADE
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The World Bank, 2010