Copper has been a good predictor for the health of the global economy. It is sometimes called Dr. Copper by fans because it’s seen as a better prognosticator of the economy than academics with Ph.D.s.

Copper price dropped 22% in September, and this was coincided with a nearly 10% fall in the Shanghai stock market since the end of July, and a 21% drop in Hong Kong’s Hang Seng Index.

More headwinds ahead…