...Massive and diverse proved reserve base and production volumes, and geographically diversified chemical and refining operations limit financial, operating, environmental, and regulatory risk. Exxon Mobil Corp. has outstanding competitive positions in all facets of the oil and gas industry. Its far-reaching, highly diversified global operations in the upstream, downstream, and petrochemical sectors provides a measure of cash flow stability despite the volatile nature of each industry. ExxonMobil's diverse operating base also limits the impact of a localized environmental incident, tighter regulation, or community opposition. The size of the company's operating base keeps costs low. ExxonMobil's size and scale in the upstream, downstream, and petrochemical industries affords significant economies of scale in each segment, and allows it to invest a portion of its capital in long-term projects, which may not generate positive cash flows for several years. Vertical integration also provides...