NO.PZ2022061307000040
问题如下：
Question Which of the following is least likely to be directly reflected in the returns on a commodity index?选项：
A.Changes in the futures prices of commodities in the index B.Changes in the spot prices of underlying commodities C.Roll yield解释：
SolutionB is correct. Commodity index returns reflect the changes in future prices and the roll yield. Changes in the underlying commodity spot prices are not reflected in a commodity index.
A is incorrect. Changes in the futures prices of commodities in the index are reflected in the index.
C is incorrect. The roll yield is reflected in the returns on a commodity index.
roll yield指的什么呀
