Paul Phillips wrote:
The tragedy of the commons is, rather, the tragedy of capitalist imperialism upon the local social regulation that makes the commons an efficient community production resource.
But isn't an aspect of the overall "efficiency" (historical viability) of a social structure its ability to withstand the pressure of competing social structures? In the present circumstances, it cannot be a strong argument in favor of communism to say that it works if and only if there are no markets or capitalism around to erode it.