A copper cake goes through a furnace. Photographer: Lauren Petracca/Bloomberg Aluminum climbed to the highest level since May 2022, extending a rally built on tightening supply in China and an improving outlook for demand as trade tensions ease. The light metal gained more than 7% in October, its best showing in more than a year, as investors and analysts bet that a state-imposed production cap in China will incrementally tighten supply as demand in sectors such as construction and consumer goods reboun ...