Copper posts biggest one-day gain in years, surpasses US$14,000 a tonne, as speculators pile in

Copper prices ​hit a record high of more than $14,000 ‍a metric ton on Thursday, as speculators extended their buying spree, encouraged by expectations of strong demand and supported by a weak dollar and geopolitical concerns. They ‍ignored warnings ​by some analysts that high prices would chill …