First published by Money Metals here: https://www.moneymetals.com/news/2017/10/16/palladium-rhodium-on-fire-001179

Platinum lost its crown to gold in 2015. It was overtaken by the other PGM metals in recent weeks. Given that platinum, palladium, and rhodium demand is largely driven by automobile manufacturing and the production of catalytic converters, one of these things is likely true; platinum is currently undervalued, or the other two have gotten ahead of themselves.