These charts show the situation. Naturally 9/11/01 was a big factor. Soon after in 2004 you can see the instability in Copper and Oil prices. And it is NOT supply and demand that is unstable like that.
https://finviz.com/futures_charts.ashx?t=QA&p=m1 Copper
https://finviz.com/futures_charts.ashx?t=QA&p=m1 Oil
https://finviz.com/futures_charts.ashx?t=RB&p=m1 Gasoline
The future always has a lot of surprises. If gasoline and oil keep on climbing, we can figure a slowdown.