"This paper finds that, concurrent with the rapid growing index investment in commodities markets since early 2000s, futures prices of different commodities in the US became increasingly correlated with each other and this trend was significantly more pronounced for commodities in the two...

We study the effects of political uncertainty on commodity markets from both theoretical and empirical perspectives. Consistent with our theoretical predictions, commodity prices and inventories decline by 6.6% and 5.7%, respectively, and convenience yields increase by 1.9% in the quarter...