Presumably the 'Commons' here is control over the government. However, the example is a trivialization of reality and that matters, in the same way that assumin

Presumably the 'Commons' here is control over the government. However, the example is a trivialization of reality and that matters, in the same way that assuming all economic actors are rational matters (they aren't). It's fun when we can use simple laws of nature to make predictions accurately. Unfortunately, it doesn't work in the field of economics\politics almost ever.