If your statement is true for capitalism it can also be true for the opposite of capitalism under i'ts many names. Socialist Economics or State Economics or Fascist Economics will do for now. If that is true, which it is then it can also be true for more than one area economics, philosophy, physica, meteorolgoy, forestry, religion, sociology, political science, WMD. What we do no is there are inexplicable occurences such as the almost robotic urge of the Republicans to cave on cue to the Democrats and the equally slavish obedience of the the left wing faithful to ...anything they are told to believe with no degree of understanding.

Without beating that horse half to death the theory becomes what should the definitions have been, what are the true definitions, and what are definitions that fit reality.

What I wrote in the first paragraphs constitutes a logical propositions. (Borrowing from a source) Axiom (disambiguation) or postulate is a premise or starting point of reasoning. An axiom is a premise so evident as to be accepted without controversy.The word comes from the Greek axíōma (ἀξίωμα) 'that which is thought worthy or fit' or 'that which commends itself as evident. As used in modern logic, an axiom is simply a premise or starting point for reasoning.

I first learned the above in high school. At what level is the above commonly taught in 2016 and in which countries? What level for the USA?

It was debate class.

THAT was worth a thumb