The shortage of semiconductors is clobbering the price of platinum-group metals as investors brace for a long-lasting hit to car production. Platinum and its sister metals palladium and rhodium -- used in pollution-cutting catalytic converters -- have all suffered sharp drops in recent weeks as carmakers shutter plants and trim output guidance. The price slump is a big contrast with the booming performance earlier in the pandemic, which was driven by supply shortages and hopes of a stimulus-led economic recovery. Rhodium, the most expensive precious metal, has suffered the most as its demand comes almost entirely ... (full story)