A. Using the previous period as base for each link
B. Fixing one base period for all comparisons
C. Using geometric mean of prices only
D. Averaging fixed base indices
Answer: Option A
Solution (By JKSSB Mock Tests)
Chain indices compute period-to-period changes (e.g., 2021/2020, 2022/2021) and chain them multiplicatively, allowing flexibility but complicating long-term interpretation due to changing bases.
Explanation:
Life expectancy at birth includes the risk of dying in infancy; those surviving to age 1 have passed this high-risk period, so their remaining life expectancy is higher than at birth.
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