The commodity price shock in the second half of 2014 cannot be attributed to any single factor or defining event.[6] It was caused by a host of industry-specific, macroeconomic and financial factors which came together to cause the simultaneous large drops across many different commodity classes. Amongst these, the transition of China's economy to more sustainable levels of growth and the shale-energy boom in the United States were the dominant demand-side and supply-side factors governing the downturn in global commodity prices.[7]