How can this be???!!!!!!!, page-18

If you look at long term inflation adjusted copper price it has mainly fluctuated around $2-$3 US$/lb with outlier years.  China's GDP growth rate has been fairly strong from the 1980's ranging form around 5% to 14% approx.  Unless something has changed you would think it would be normal for copper to go down around $2 in times of poor demand (high supply) and increase to around $3 in times of good demand (low supply).  Its all to do with future demand and supply though obviously.

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