While it is likely copper will see markedly increased demand due to global electrification, there are a number of substitutes that can come into play when Cu supply is crimped or prices rise too quickly. Chief amongst these is aluminium, which is already a staple in China's vast high voltage network and increasingly seen in Australian power utilities. While copper clearly can't (and shouldn't) be substituted in every situation, there are sufficient applications to keep Cu prices in check.
Authors seem to conveniently ignore of forget this when drafting their articles.
Cheers F
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