It is pretty clear, however, that the Inca operated a system not far off what Polanyi postulated for the Maya. This is because the Inca were still around to have stuff written down about them. The Maya were well past their sell-by date by the time the Spanish showed up, so their economic systems had to be inferred.
Not anymore, based on the techniques cited in the brief article.
And who is to say that the Inca didn't have a similar system prior to their decline into what they were when Pizzaro and his men showed up? Perhaps even their earlier history was rewritten, much like our elite are doing with ours.