The Grubel–Lloyd index measures intra-industry trade of a particular product.
It was introduced by Herb Grubel and Peter Lloyd in 1971.
where Xi denotes the export, Mi the import of good i.
If GLi = 1, there is a good level of intra-industry trade.
This means for example the Country in consideration Exports the same quantity of good i as much as it Imports.
This would mean that the Country in consideration only either Exports or only Imports good i.
This international trade related article is a stub.