Question:
Other analysts point out, however, that if the economy is operating below the optimal saving rate, saving can rise without overly depressing market rates of return and, therefore, provide significant improvement to future incomes.

Does it follow that "Increased savings always depress market rates of return."?
Answer:
it is not possible to tell

Question:
Or, to put it another way, in the sense of asking an entirely different Is it really a requirement of sophistication that a place provides good bookstores, movies, plays, museums, music, cuisines, and an opportunity for erotic and intellectual freedom?

Does it follow that "Should a sophisticated place offer museums and music?"?
Answer:
yes

Question:
Here, the felucca (Nile sailboat) pilots gather, trying to sell an afternoon or sunset trip on their graceful craft, and Nile Cruisers lie several abreast, disgorging their passengers for tours or shopping trips.

Does it follow that "This is the only place in which the pilots of the Nile sailboat assemble. "?
Answer:
it is not possible to tell

Question:
From then until 1812, when the intrepid Swiss explorer John L. Burckhardt rediscovered Petra, it was almost totally forgotten.

Does it follow that "Petra grew in name and popularity until 1812 when a Swiss explorer destroyed it."?
Answer:
no