Countries enriched by the commodity boom are increasingly asserting their power, with Venezuela nationalizing oil fields and Russia threatening to cut off natural-gas supplies to Western Europe.

• 因大宗商品价格暴涨而致富的国家正在不断显示它们的力量，委内瑞拉的油田被国有化，而俄罗斯威胁会切断向西欧的天然气供应。