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IIT (Aggregate Marginal)
This index gives us an overall measure of how much of the trade expansion between two periods was intra-industry, and how much was intra-industry.The aggregate marginal intra-industry trade index is the marginal equivalent of the aggregate IIT index and is obtained as a weighted average of the sectoral indices, with the weights provided by the shares in marginal trade.

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Definition:
The marginal trade share weighted average of the marginal IIT indices for each sector of the economy.

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