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I'm rather curious about point #2 especially the words marketing and militarism. Won't artists and authors still want to advertise their works so more people can read or see it?
I describe marketing as waste because modern capitalism has an entire "industry", and it's one of its largest "industries", centered around the socially-useless goal of persuading people to switch brands back and forth. They'll spend a billion dollars to persuade people to switch from Pepsi to Coke, and spend another billion dollars to persuade people to switch from Coke to Pepsi. I put such business expenses in the same category as the military arms race - the more the other side wastes, the more this side has to waste, and vice verse. Competitors can't let themselves fall behind by seeing their competitors waste more than they do, so when the competitors increase their waste one must respond by increasing one's own waste. It's productive capacity that could have been used for something useful.
In a society without business competition, a computerized index of information about the availability and specifications of goods and services can be established with very little use of resources. But today's advertising "industry" is an enormous consumption of resources to achieve something that has an information content of virtually zero.
I mention this subject because many people think the projected standard of living in a socialist system can be estimated by imagining the capitalists' profits being redistributed to the workers. That gives a very inaccurate answer. Much, perhaps most, of the surplus value (the Marxian term for the wealth that workers produce but don't get back in the form of wages) doesn't go to the capitalists' profits. It goes to perform activities that are socially unnecessary by artificially made by capitalism to appear necessary.
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Also for militarism there will be people opposed to the communist system who would revolt and also the remote possbility of an extraterrestrial threat (don't mock me for this but I do think even if the world was completely at peace we'd need a strong military in case of such a threat).
I think the people opposed to communism who would revolt will be a problem or about one week, since they would revolt only because the don't know what they're getting, and they will soon find out. After they are informed that they are to receive something like three times the income for one-third the workweek duration, their desire to revolt will have lost its purpose.
If the extraterrestrials are so advanced that they can travel across interstellar space, human weapons would probably be useless. The extraterrestrial technology probably wouldn't be a few hundred years ahead of our, but millions of years ahead of ours.