Platinum is perhaps the most out of favor of the precious metals. It continues to languish after the Volkswagen scandal from years ago. In the meantime, palladium has hit new highs. The last time palladium overtook platinum was 2001 when it hit a record $1,100 an ounce before falling to $315 later that year, all this with platinum around $650 an ounce.
During that period the auto makers decided to change their process for producing catalytic converters to use more palladium since, at the time, it was much cheaper than platinum. Palladium, however, is much rarer and shot up from around $425 to $1,100 an ounce in roughly one year, as I previously mentioned.
Eventually palladium was about $450 an ounce more than platinum. At that point it was worthwhile for the manufacturers to switch back to using more platinum and the price of palladium tumbled. Over the next three years platinum approached $1,000 an ounce and eventually topped out in 2008 at nearly $2,300 an ounce. Palladium continued to drop to $184 an ounce and topped out at under $600 an ounce in 2008.