Practically speaking, I suppose a hypothetical scenario could be that the:
- the companies are granted patents
- the vaccine lasts for a limited amount of time
- before each patent expiry they companies make minor modifications (say, storage temperature requirement decreased by half a degree)
- the company make "unfair" profits by extending the oligopoly for a very long amount of time
I'm not stating that this will happen, but on the other hand, I find this plausible.
In addition, the aforementioned patents prevent disruption. Even long after the original patent expires.
Practically speaking, I suppose a hypothetical scenario could be that the:
- the companies are granted patents
- the vaccine lasts for a limited amount of time
- before each patent expiry they companies make minor modifications (say, storage temperature requirement decreased by half a degree)
- the company make "unfair" profits by extending the oligopoly for a very long amount of time
I'm not stating that this will happen, but on the other hand, I find this plausible.