As a bit of an aside, there's a theory that the reason larger animals, such as whales, don't succumb to cancer is because eventually multiple tumours end up combating each other, keeping each other in check enough to keep the host alive.

Obviously that only works if all the tumours function similarly though, and one isn't upending the balance through shifty means.

A pretty apparent analogy to the free market idea, and it does beg the question why cancer should occur in the first place, but perhaps the analogy starts falling apart at that point.