Index NumbersMCQPYQ May 18Question 3779 of 197
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Circular test is satisfied by

Options

ALaspeyre's Index Number
BPaasche's Index Number
CThe simple geometric mean of price relatives and the weighted aggregative with fixed weights
DNone of these
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Correct Answer

Option cThe simple geometric mean of price relatives and the weighted aggregative with fixed weights

All Options:

  • ALaspeyre's Index Number
  • BPaasche's Index Number
  • CThe simple geometric mean of price relatives and the weighted aggregative with fixed weights
  • DNone of these

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Detailed Solution & Explanation

The **Circular Test** requires that the index formula allows for base shifting easily, such that: P01×P12×P20=1P_{01} \times P_{12} \times P_{20} = 1 Let's analyze the methods that satisfy this: 1. **Simple Geometric Mean of Price Relatives**: Pab=(i=1npb,ipa,i)1nP_{ab} = \left(\prod_{i=1}^n \frac{p_{b,i}}{p_{a,i}}\right)^{\frac{1}{n}} P01×P12×P20=(i=1np1,ip0,i)1n×(i=1np2,ip1,i)1n×(i=1np0,ip2,i)1n=1P_{01} \times P_{12} \times P_{20} = \left(\prod_{i=1}^n \frac{p_{1,i}}{p_{0,i}}\right)^{\frac{1}{n}} \times \left(\prod_{i=1}^n \frac{p_{2,i}}{p_{1,i}}\right)^{\frac{1}{n}} \times \left(\prod_{i=1}^n \frac{p_{0,i}}{p_{2,i}}\right)^{\frac{1}{n}} = 1 Thus, simple GM of price relatives satisfies the test. 2. **Weighted Aggregative Index with Fixed Weights**: Pab=pbwpawP_{ab} = \frac{\sum p_b w}{\sum p_a w} P01×P12×P20=(p1wp0w)×(p2wp1w)×(p0wp2w)=1P_{01} \times P_{12} \times P_{20} = \left(\frac{\sum p_1 w}{\sum p_0 w}\right) \times \left(\frac{\sum p_2 w}{\sum p_1 w}\right) \times \left(\frac{\sum p_0 w}{\sum p_2 w}\right) = 1 Thus, the weighted aggregative index with fixed weights also satisfies the test. Standard weighted indexes with variable weights (like Laspeyres, Paasche, Fisher) do not satisfy this test. Hence, **Option C** is the correct answer.

About This Chapter: Index Numbers

Paper

Paper 3: Quantitative Aptitude

Weightage

4-6 Marks

Key Topics

Construction of Index Numbers, Time Series

This chapter covers Construction of Index Numbers, Time Series and is part of Paper 3: Quantitative Aptitude in the CA Foundation exam.

View Official ICAI Syllabus

Exam Strategy Tip

This topic carries 4-6 Marks weightage. Focus on understanding core concepts rather than memorizing.

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