Independent analyses by both the University of California macroeconomist James Hamilton and the Bank of England have fingered weak demand as the chief cause of low oil prices. Given that China is the driver of incremental demand for most commodities, weak prices must therefore be principally attributed to weakness in the Chinese economy.

But what sort of weakness is this? The thinking splits two ways. Many analysts anticipate a gradual slowdown in China's underlying growth rate as it migrates from an investment-led to a consumer-led economy. By this view, China is facing a structural re-alignment, with the shift requiring another two to four years. Things are slowing down, but it's nothing serious.