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Question

Calculate weighted aggregative of actual price index number and quantity index number from the following data using (i) Laspeyre's Method , and (ii) Paasche's Method and (iii) Fisher's Method and interpret them.
Commodity Base year Current Year
Quantity
lbs.
Price
per lb.
Quantity
lbs.
Price
​per lb.
Bread 6 40 paise 7 30 paise
Meat 4 45 paise 5 50 paise
Tea 0.5 90 paise 1.5 40 pAise

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Solution

Base Year Current Year
Quantity
q0
Price
p0
Quantity
q1
Price
p1
p0q0 p1q1 p1q0 p0q1
Bread
Meat
Tea
6
4
0.5
40
45
90
7
5
1.5
30
50
40
240
180
45
210
250
60
180
200
20
280
225
135
∑p0q0 = 465 ∑p1q1 = 520 ∑p1q0 = 400 ∑p0q1 = 640

(i) Price Index number
(a) Laspeyre's p01=Σp1q0Σp0q0×100=400465×100=86.02

(b) Paasche's p01=Σp1q1Σp0q1×100=520640×100=81.25
(c) Fisher's p01=Σp1q1Σp0q1×Σp1q0Σp0q0×100=520640×400465×100=83.60

(ii) Quantity Index number
(a) Laspeyre's q01=Σq1p0Σq0p0×100=640465×100=137.63

(b) Paasche's q01=Σq1p1Σq0p1×100=520400×100=130

(c) Fisher's q01=Σp0q1Σp0q0×Σp1q0Σp1q0×100=520400×640465×100=133.76

The price index number for current year is 86.02 and 81.25 as per Laspeyres's method and Paasche's method respectively. This implies that there is net decrease in the prices in current year by 13.98% and 18.75% from the base year as per Laspeyres's method and Paasche's method respectively.

The quantity index number for current year is 137.63 and 130 as per Laspeyres's method and Paasche's method respectively. This implies that there is net increase in the quantity demanded by 37.63% and 30% from the base year as per Laspeyres's method and Paasche's method respectively.

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