中等ECON-INFL-007
The CPI can overstate the rise in the cost of living when households switch to goods that have become relatively cheaper. This is:
A. The natural rate of unemployment
B. Substitution bias from a fixed basket✓ 答案
C. A cash drain from the money multiplier
D. Proof that discouraged workers are inside the CPI basket
解說
A fixed basket does not follow substitution toward relatively cheaper goods, so the measured price rise can exceed the rise in the cost of the basket people actually buy. That is not an unemployment or banking concept.