Components of Consumer Price Index Construction

Steps:

• Recall that a Consumer Price Index (CPI) tracks average price changes for a basket of consumer goods and services over time.
• Identify core elements: base period for comparison, representative items reflecting typical spending, and weights based on expenditure proportions.
• Eliminate options unrelated to price measurement, focusing on those tied to price data collection and calculation.
• Confirm CPI formula involves price relatives weighted by base-year quantities, excluding wage computations.

Why C is correct:

• CPI measures inflation via price changes in a fixed basket, not wage levels, which relate to real income adjustments like cost-of-living allowances.

Why the others are wrong:

• A: Base year establishes the reference point for price relatives in the Laspeyres index formula.
• B: Representative items form the market basket to ensure the index reflects typical consumer purchases.
• D: Weighting allocates importance to items based on their share of total consumer spending in the base year.

Final answer: C