Sentence 1: Expressing all of our analysis as a share of GDP provides a consistent frame of reference for comparing economywide shares for the United States and for comparing U.S. saving rates to those of other countries.

Sentence 2: GDP is a way to let the U.S. know who their global competitors are.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: Then continue to the top of Jakko Hill, where you can see a fine view of the town and valley.

Sentence 2: Proceed up Jakko Hill, where you can look down on the town and valley.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: Shall we go in?" A policeman produced a key.

Sentence 2: A policeman had the key.
Is this second sentence entailed by the first?

Answer:
yes