The yuan dynasty was brought down by all of the following except
(a) foreign resistance to the mongol peace.
(b) bubonic plague.
(c) economic distress.
(d) inefficient administration.
(e) a breakdown in internal security.

Which of the following questions must be asked about the use of resources in an economic system a. what allocation will provide the fastest growth b. what is the most secure allocation c. what is the fairest allocation d. what is the most effective allocation