Reference request on "post-scarcity" economics? Some friends and I have been discussing, speculatively, what might happen in the future after technology/increased automation greatly reduces the need for human labor.

The Marxists / leftists among us think that there will be a coming class conflict as more and more of the productivity gains from automation are captured by an elite, and that there will be a widespread political push from the left for something approaching a basic income.

Other, less left-leaning folks among us worry that there will be a collapse in aggregate demand as the purchasing power of a sizable, jobless part of the labor market essentially exits the economy. How government might respond to that is unclear.

I have the equivalent of an undergrad degree in economics and figured that there had to be some good discussion out there. 

Can anybody point me to any papers or extended discussions of this topic?
A related question is in asking when (if ever) will we be post scarcity. The paper Are We Approaching an Economic Singularity? Information Technology and the Future of Economic Growth by William D. Nordhaus should be of use.

Abstract:


  What are the prospects for long-run economic growth?, the present
  study looks at a more recently launched hypothesis, which I label
  Singularity. The idea here is that rapid growth in computation and
  artificial intelligence will cross some boundary or Singularity after
  which economic growth will accelerate sharply as an ever-accelerating
  pace of improvements cascade through the economy. The paper develops a
  growth model that features Singularity and presents several tests of
  whether we are rapidly approaching Singularity. The key question for
  Singularity is the substitutability between information and
  conventional inputs. The tests suggest that the Singularity is not
  near.


(emphasis mine)

Another possibility is to consider those sectors, like digital media, where we are already post-scarcity, in that marginal costs are zero or very near to it. I recommend Carl Shapiro and Hal Varian's Information Rules for an accessible and interesting discussion of the economic issues that arise in this setting.