f) If we assume base year = 2008
Consumer price index for year 2008 = 100
Consumption of bread by a typical household = 90 units and consumption of haircuts by a typical household = 2 and therefore, we can show weights and price schedule of two goods bread and haircuts in the following table:
Year |
Bread Weight= Single household consumption/total household consumption |
Price |
Haircuts Weight |
Price |
2008 |
0.0000181 |
$1 |
0.000020 |
$50 |
2009 |
0.000018 |
$1 |
0.00002 |
$50 |
2009 |
0.0000178 |
$1.05 |
0.0000192 |
$55 |
The Consumer price index for year 2009 = Weighted average prices of bread and hair cuts in 2009/weighted average prices of bread and hair cuts in 2008*100= (0.0000181*1+0.00002*50)/(0.000018*1+0.00002*50)*100 =100
The consumer price index for year 2010 = Weighted average price of bread and hair cuts in 2010/weighted average prices of bread and hair cuts in 2008 = (0.0000178*1.05+0.0000192*55)/(0.000018*1+0.00002*50)*100 = 105.568
CPI inflation rate for year 2009 = (CPI for 2009-CPI for 2008)/CPI for 2008*100= 0
CPI inflation rate for year 2010= (CPI for 2010-CPI for 2008)/CPI for 2008*100=(105.568-100)/100*100= 5.568%
g) CPI inflation rate for year 2009 best describes change of the total dollar value of all transactions that take place in an economy.
i) The CPI growth or inflation rate of 2009 best describes change in economic activity as it reflects actual increase in total consumption of breads and haircuts of households.
ii) The CPI inflation of 2010 reflects loss of currency value for typical consumers.
iii) The CPI inflation of year 2010 reflects change of number of consumption of goods by a typical household in view of rise in prices.
iv) The CPI inflation of year 2009 reflects change of the total dollar value of all transactions that take place in an economy.
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