巴里·克拉克说，还有另外一种效率，称作“交换效率”。它涉及的是“为谁生产”的问题。
And there's another type of efficiency - what's referred to as exchange efficiency and this impacts on the for whom question.
生产什么和生产多少，如何生产，为谁生产等三大经济问题是经济学具有基础理论性质的问题。
What is production, how much should be the output, how to produce and for whom is production intended-these are three basic theoretical problems pertaining to economics.
任何社会、任何国家在经济活动中都会面对三个基本经济问题：生产什么，如何生产和为谁生产的问题。
There are three basic economic problems, what to produce, how to produce and for whom to produce in economic activities in whatsoever societies and countries.
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