Question

why is the export of manganese is contantly decrecesing
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Answer 1

The declining trend in export is mainly attributed to stiff competition from the South Africa, Mexico, Brazil, Australia etc; lack of demand, low price, increasing domestic consumption and restriction imposed on the export of high grade ores.

Answer 2

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$\sf Exports\: constantly \:decreasing \:due \:to$$\sf increasing \:domestic \:demand.$