Copper Corroding PPI By: TalkMarkets June 15, 2021 at 22:17 PM EDT Yesterday, lumber. Today, copper. The “doctor” has been in reverse for better than two months now, with trading in the current session pounding the commodity to a new multi-month low. Read More >> Related Stocks: Global Timber & Forestry Ishares ETF Ipatha.B Copper Subindex TR ETN