The post I answered to assumed that only two entities existed in the island: financial actors and fishermen and explores what it means for the economy when we apply the basic assumptions of free-market : individual agents planning for short-term gains.

I worked within those bounds, I am actually a pretty strong advocate of sane regulation of free-market, partly because I agree with the GP: free-markets unchecked lead to some insane financial cons. And also to the tragedy of the commons that you explain.