1、Assuming no short selling, diversification benefit is most likely to occur when the correlations among the securities contained in the portfolio are:［ 单选题］
A.equal to positive one.
B.less than positive one.
C.greater than positive one.
正确答案:B
答爰解析:"Probability Concepts/ Richard A. Defuse。, CFA, Dennis W. McLeavey, CFA, Jerald E. PI nt。, CFA, and David E. Runkle, CFAWhen we do not reject a fake null hypothesis we have a Type II error.
2、Which of the following obstacles to efficiency least likely leads to overproduction?
A.External costs.
B.External benefit.
C.Common resource.
正啸答案:B
答案解析:外部成本是指企业在生产决策中没有考虑到的对于社会的族外成本，比为环境污染等,应该减少产量，此时企业产量用过了*生产量，造成了过度生产。外部收拄是指企业在生产决策中没有考虑到的对于社会的弑外收益，比如净化空气等，应该增加产量，此时企业产量低于了聚优生产量，造成了过少生产，公共麦源由于没有规范产权，所有人都可以使用，也会造成过度生产。
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