What happens when you combine "survival of the fittest" with "supply and demand"? Too much survival may create a surplus of surviving supply... lowering the value of it, and the demand for it, and maybe the ability for it to continue surviving as well. Value might shift from that kind of survival to a rarer form. What does that mean? I think it means that we might need to make synonyms of fittest and most valuable and that you can probably talk about evolution in economic terms. It creates a constantly moving target for value and fitness, which is probably a good thing since it ensures that the top doesn't stagnate, even if the environment does. Not sure why I started thinking about this, or why it matters.