A Short Introduction to Participatory Economics

In a very clever format...

Read up on this truly third way here. Since reading all of that will take you a lifetime, try reading either or both of the following, either online (below) or you can find 'em in treeware form:
And, since I just learned how to make, as opposed to simply grab, a playlist on YouTube, here's one of a multipart lecture by Michael Albert on Parecon:

More, probably with some overlap:

Finally, David Graeber, anthropologist, on an allied topic, participatory democracy; see an ever broader perspective ("participatory society") here. These allied movements seem to me to be the logical outcome of eighteenth-century liberal thought -- the logical outcome, mind you, not the historical outcome thus far.

Graeber on Charlie Rose: