Since 1870, there have been several formal attempts to restrict the copper output and raise, in this form, its price.
This is a list of copper cartels in the 20th century:
Prior to the rise of copper prices in late 2003 as part of the 2000s commodities boom various copper mining companies exhibited cartel-like behaviour. This consisted of announcements made in late 2001 for production cuts for 2002 which were carried out, and a repetition of similar announcements for 2003 in late 2002. [1]
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