In the previous article, I discussed the global nature of the oil markets. But the shale oil boom in the U.S. temporarily increased the localized impact on the West Texas Intermediate (WTI) benchmark. As a result, its price diverged from that of international crudes for a few years. The natural gas markets, on the other hand, are far more localized due to the difficulty in transporting natural gas. That means that natural gas in the U.S. could be $3 per million British thermal units (MMBtu), but double or triple that level in Japan or Europe.