Sentence 1: He knew that students would not find microeconomics, with its emphasis on efficiency, interesting unless they were first convinced that the economy could achieve more or less full employment, that it need not relapse into depression.

Sentence 2: He knew the only way he could get his students to learn microeconomics was to convince them their understanding of the economy was vital to their future ability to find jobs and maintain the national economy in the next 50 years.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: why there been so much work done already

Sentence 2: Why has so much work been done already?
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: The reason is that it diverts attention from something called enterprise, by which Keynes means the development of real operating businesses.

Sentence 2: Real operating businesses include Google and Apple
Is this second sentence entailed by the first?

Answer:
it is not possible to tell