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IIT (Aggregate)
The aggregate intra-industry trade index provides us with an overall measure of the relative importance of intra-industry trade in an economy’s trade profile. As with sectoral IIT, higher ratios suggest that the economies of scale and variety sources of gains are being exploited. Alternatives are the trade overlap index, and the complementarity index (when applied to a single country).

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Definition:
The trade weighted average of the sectoral IIT indices (the weights are provided by the trade shares).

Range of values:
The index ranges from 0 to 1, with zero indicating pure inter-industry trade, and one indicating pure intra-industry trade.

For further note on this indicator, including an example and formula, see the relevant section of Trade Statistics in Policymaking: A Handbook of Commonly Used Trade Indices and Indicators.

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