Class 11 Economics - CBSE
Index Numbers
The chapter Index Numbers in Class 11 CBSE Economics introduces you to statistical devices used to measure changes in a variable or a group of related variables over time or space. Often called the 'barometer of economic activity,' index numbers help us understand inflation, cost of living, and industrial production. You will learn about construction methods like simple and weighted aggregative and average methods, along with important formulas such as Laspeyres, Paasches, and Fishers ideal index. This chapter is vital for board exams as it tests both theoretical understanding and numerical problem-solving skills.
Start Learning FreeKey Concepts
Index Number
A statistical measure designed to show changes in a variable or a group of related variables with respect to time, geographic location, or other characteristics.
Base Year
The reference year against which comparisons are made for the current year; its index value is generally taken as 100.
Current Year
The year for which the index number is being calculated to measure changes relative to the base year.
Simple Aggregative Method
An unweighted method that compares the sum of prices in the current year to the sum of prices in the base year.
Weighted Index Numbers
Index numbers where different items are assigned weights based on their relative importance in consumption or production.
Consumer Price Index (CPI)
An index that measures the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services.
Important Formulas
Board Exam Info
This chapter typically carries around 6 to 8 marks in the CBSE Class 11 Economics exam. Questions usually include a direct numerical problem on calculating index numbers (like Laspeyres, Paasches, or Fishers) carrying 4 marks, alongside 1-2 marker conceptual questions regarding limitations, consumer price index, or the choice of base year.
Frequently Asked Questions
Why is Fishers Index Number considered an ideal index?
Fishers index is called ideal because it satisfies both the time reversal test and factor reversal test, and it uses quantities of both the base year and current year.
What is the difference between a weighted and unweighted index number?
Unweighted index numbers treat all items in the series with equal importance, whereas weighted index numbers assign specific weights to items based on their relative economic importance.
How do you choose a good base year?
A good base year should be a normal year free from abnormal conditions like wars, famines, booms, or severe economic depressions.
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