A. I was not defining collective bargaining, just giving an example of the difference between colloquial and economics demand. But lets just ignore that point as its largely unrelated. I removed it from my original comment.

B. No, it is not clear, IMO. His use makes it seem like he is actually referring to demand, when in fact he is using the colloquial definition. People routinely confuse the two.

C. Semantics become important when things become ambiguous and confusing. Most programmers would likely agree with this.

D. Fair.