The first half of 2017 was mostly neutral for commodities except for a second-quarter rally for livestock and a decidedly bearish trend for energy. By the end of the year, energy commodities, precious metals and industrial metals were up 16 percent, 12 percent and 32 percent, respectively, while agricultural crops were down 4 percent on the year. Although crude oil prices have not returned to their 2011-2014 levels, they did rise in 2017 for the second straight year. Much of this was driven by the production cutback coordinated by the Organization of the Petroleum Exporting Countries (OPEC) late in 2016, which was executed in 2017 and extends through 2018. In addition, global demand increased in 2017 and is expected to rise again this year...