This is an original preparation plan, not a new examination announcement. Check dates, stages, eligibility and application instructions in the issuing authority’s current notice.
01 / UNDERSTANDING
Plan your preparation
Draw a two-row current-and-base timeline before practising annual rate interpretation under time pressure. Calculate annual and sequential rates on the same invented timeline. For a later review, explain the arithmetic before suggesting economic causes. Keep a specific error note about using the previous month as the base for an annual comparison. Use a changed example after a short gap so that remembering one answer does not disguise a remaining misunderstanding.
02 / UNDERSTANDING
The concept in context
Base effects arise when the earlier observation used for a percentage comparison is unusually high or low. Annual inflation can change because the comparison base changes, even when the recent price-index movement appears modest. Write both the current observation and the year-earlier denominator before interpreting an annual rate.
03 / UNDERSTANDING
A worked learning case
At one comparison date an invented index is 120 against a year-earlier 100, giving 20% annual inflation. At the next date it is 121 against an earlier base of 110, giving 10%. The current index has risen from 120 to 121, yet the annual rate has dropped because the comparison base is substantially higher.
ORIGINAL EDUCATIONAL PRACTICE
Try it before you check.
What is the second annual inflation rate in the example?
Show the answer and reasoning
10%.
The second comparison uses 121 as the current index and 110 as the year-earlier base. Their difference is 11, and 11 divided by 110 equals 10%. Comparing 121 with 100 would use the wrong period. The lower annual rate can coexist with a rise in the current index.
Two traps to watch for.
- Using the previous month as the base for an annual comparison.
- Treating a favourable base effect as proof of falling current prices.
YOUR TOPIC-SPECIFIC LEARNING MAP
Build your next study session
Align each observation with its year-earlier base.
Calculate annual and sequential changes separately.
Explain the arithmetic before suggesting economic causes.
Explain the idea, apply it to a new situation, then check what changed in your reasoning.
BANKERS TUTORIAL · SOURCE NOTES
Keep the source alongside your notes.
Official links provide subject context and authoritative reference material. This guide’s explanation, scenario and question are original Bankers Tutorial learning content.
- ncert.nic.in https://ncert.nic.in/textbook.php?leec1=ps-6
- www.rbi.org.in https://www.rbi.org.in/scripts/DataDefinition.aspx
For RBI preparation, check the current official notice before relying on changing dates, rules or examination requirements.
