China giveth, China taketh away.
China giveth: Its boom years boosted prices of commodities, from crude oil to copper to corn. A country of 1.3 billion people whose economy is growing 10% a year consumes a lot of commodities.
China taketh away: Because it is the world's largest consumer of many commodities, absorbing more than half of the world's output of some of them, its inevitable economic slowdown savaged commodity prices. The Chinese economy's growth rate fell to an estimated 7% last year. The Chinese government's target for the next four years is 6.5% annual growth.
So there's no joy ...