Companies such as Penn Central may fall into two categories at once, and Disney, over its lifetime, has been in every major category: years ago it had the momentum of a fast grower, which led to the size and financial strength of a stalwart, followed by a period when all those great assets in real estate, old movies, and cartoons were significant. Then, in the mid-1980s, when Disney was in a slump, you could have bought it as a turnaround.

