I made no argument that cooperation emerges in the PD environment, quite the opposite. I argued that, once it emerged in a non-PD environment, it does not necessarily die out in a PD environment. No group selection required.
I made no argument that cooperation emerges in the PD environment, quite the opposite. I argued that, once it emerged in a non-PD environment, it does not necessarily die out in a PD environment. No group selection required.