It may seem odd to remove one of only two oil companies in the index at a time when the shale boom has transformed America’s role in the global market. After all, the U.S. now produces more oil and more natural gas than any other country. Last year’s domestic oil production was up by 125% from levels in 2010, while gas output has increased by 60%.
But those figures only tell part of the story, and not the most important part.
It’s not the first time that there’s only been one oil and gas company in the Dow. The last time was between 2000 and 2008, when Exxon was the sole industry representative. Before that you have to go back to the 1920s. For a brief period of two weeks in 1924, there were none at all.