[goldenkey]

Except this ignores scarcity. And also ignores post-scarcity; this is the time period when robots do all work and farm all resources leaving humanity to decide the value of things divorced from rarity and labour. I will concede to Marx one aspect of his maxim; that is, scarcity is directly correlated with human effort towards a reseller market. So it still applies even if indirectly. For example, there is less labour spent trying to skim off the top of automotive mechanics work than labour spent reselling gold or limited edition Nike Airheads, etc....