Respuesta :
Answer: b. The CPI decreases
Explanation:
The Consumer Price Index (CPI) measures any change in the price level of a weighted average market basket of consumer goods and services.
It is stated that Good X constitutes 70% of consumer spending and Good Y constitutes the remainder which would be 30%.
If X decreases by 10% and Y increases by 10%, what would happen to the CPI?
Because the CPI is a weighted average, we can use the following,
Change in CPI = 0.7(-0.1) + 0.3(0.1)
= -7 + 3
= -4%
This means that the CPI will DECREASE by 4% because the price decrease occured in the Good with the higher Consumer Budget share.
In the case when the price of Y increases by 10% while the price of X decreases by 10% then, all else held constant so here CPI should decrease.
Impact on CPI:
Weight of Good X = 70%
Weight of Good Y = 30%
Since price of X declines by 10% and price of Y increases by 10%, the overall impact on CPI provided
Impact on CPI = ( Weight of X * Change in Price ) + ( Weight of Y * Change in Price )
Impact on CPI = ( 0.7 * -0.1 ) + ( 0.3 * 0.1 )
Impact on CPI = -4.00%
Therefore, CPI Decreases.
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