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A spell to grade tests is probably not an old spell that's been around forever since no one else seems to use it, but QQ may have invented it for this purpose.
Either way, it's existence is a further hint to the nature of magic in the world of HPMOR. It involves some pretty sophiscated natural languge processing. The fact that magic can do natural language processing is hinted as significant in chapter 6 while Harry is studying the retrieval charm and trying diffent phrases that point to "bag of gold". If we knew how magic could read a test and predict what the ministry would give it, we would know a lot more about magic.
Note, we can reject the hypothesis the the spell just doing something simple like implements a big data style algorithm with 800 years of prior tests and grades as its training corpus because QQs students are going to be writing answers that are very different from the training set and so the model wouldn't have good predictive power
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The examples you outlined there are part of a governing system called the Commons, which is an older system than capitalism. That is what the author was advocating. Edit: This first paragraph is very badly phrased, but I can't rephrase it properly right now. Sorry for any confusion.
He proposed that this sort of system would not allow for rampant abuse, and gave examples of how in various Commons around the world, resources were self-regulated by the community.
People do not necesarilly need a market to prevent them from wasting electricity. That is part of the governing structure of the commons, wherein social rules prevented overconsumption from occurring.
Yes, there are economies of scale which allow for things like batteries to be built. In fact, one needs to be able to use such economies of scale in order to make a profit. But 3D printing requires no such thing. You pointed out that nothing that could be made by a 3D printer springs out. But your flat itself is able to be made by 3D printers, and at a much lower cost than what we currently have. You can also 3D print solar panels. And this is just right now. The technology keeps on getting better.
I'm not getting what would be so great about 3D printing solar panels at all - are you saying that 3D printing electronics will become as cheap as producing in bulk? That kind of seems unlikely to me.
Or are you using the words 3D printing to mean that producing things in general will become much much cheaper? If so what about the resources required or are they not as big a part of the cost as I think?