1、Assuming no short selling, diversification benefit is most likely to occur when the correlations among the securities contained in the portfolio are:［ 單選題］

A.equal to positive one.

B.less than positive one.

C.greater than positive one.

正確答案: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.

正嘯答案:B

答案解析:外部成本是指企業在生產決策中沒有考慮到的對于社會的族外成本，比為環境污染等,應該減少產量，此時企業產量用過了*生產量，造成了過度生產。外部收拄是指企業在生產決策中沒有考慮到的對于社會的弒外收益，比如凈化空氣等，應該增加產量，此時企業產量低于了聚優生產量，造成了過少生產，公共麥源由于沒有規范產權，所有人都可以使用，也會造成過度生產。

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