The introduction of the first commodity ETF cracked open an asset class that had once been off limits to a number of investors. Commodity investing was reserved only to those with complex futures trading accounts and who had the time and ability to actively trade. Now, the average Joe can add something like physical gold exposure to their portfolio with relative ease. Commodity ETFs have quickly become the most popular way to make a play on this volatile asset class, as investors have been relatively quick to adopt these securities [for more commodity ETF analysis subscribe to our free newsletter].