What do Amazon (consumer goods), Berkshire (investments, many in "boring" companies), and Exxon (energy) have in common? They're all massive businesses with no

What do Amazon (consumer goods), Berkshire (investments, many in "boring" companies), and Exxon (energy) have in common? They're all massive businesses with no product cycle (and mostly no recognizable "product" at all). They are unlikely to be quickly undone because not only does their business planning go on for decades, their customers do too. This is not a sufficient condition for corporate longevity (see: Hostess, Lehman, Enron), but it might be a necessary one.