Over at the CUNY advocate, Konczal and I have a back and forth on the idea of a graduate tax (sometimes called Pay It Forward). The first two pieces were written a while ago, so they may be somewhat dated (e.g. in student debt figures). But overall they are good. My impression was that there would be a couple of other authors (though that was a long time ago). But so far, the Advocate has only posted mine and Konczal’s.