Explain how Human Development Index (HDI) are used as indicator to measure development

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Explanation:

The Human Development Index (HDI) is a summary measure of average achievement in key dimensions of human development: a long and healthy life, being knowledgeable and have a decent standard of living. ... The HDI uses the logarithm of income, to reflect the diminishing importance of income with increasing GNI                                      

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productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answer; psychological influences;