The world’s two biggest metals are being priced way above the supply and demand fundamentals, raising fears about a supply crunch.
The price of silver, the world’s biggest metal, has been steadily rising since 2008, even as it fell for the first time in decades.
Meanwhile, aluminum prices have plunged from their peak in the early 1990s.
These metals have fallen by around 10% a year for the past 20 years.
Aluminium prices have also fallen, though still around 50% higher than in the late 1990s and early 2000s.
Al Jazeera’s James Brimelow reports from London.