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Regional Hirschmann
The Hirschmann index is a measure of the geographical concentration of exports. It tells us the degree to which a region or country’s exports are dispersed across different destinations. High concentration levels are sometimes interpreted as an indication of vulnerability to economic changes in a small number of export markets.

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Definition:
The regional Hirschmann index is defined as the square root of the sum across destinations of the squared export shares for the region under study to all destinations.

Range of values:
Takes a value between 0 and 1. Higher values indicate that exports are concentrated on fewer markets. Value of 1 indicates that all exports go to a single destination.

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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