The one variable that stands out as the most significant explanation of large variations in living standards around the world is ( )

A. productivity.
B. population.
C. preferences.
D. prices.

Which of the following lists contains, in this order, physical capital, and human capital? ()

A. For a shoe factory: hand tools, the managers' knowledge of shoe making.
B. For a steel mill(炼钢厂): iron ore(铁矿石), the workers.
C. For an airline: the pilots' knowledge of flying, jets(喷气机).
D. None of the above is correct.

A management professor discovers a way for corporate management to operate more efficiently. He publishes公开发表 his findings in a journal. His findings are

A. proprietary and common knowledge.
B. neither proprietary nor common knowledge.
C. proprietary, but not common, knowledge.
D. common, but not proprietary, knowledge.

Upland has a population of 15,000, of whom 9,000 work 8 hours a day to produce real output of $342,000.Lowland has a population of 8,000, of whom 7,000 work 7 hours a day to produce real output of $171,500.Q:Upland's productivity is $() per hour;Lowland's productivity is $() per hour;Hence, Upland has a ( higher or lower) standard of living than Lowland does.