The CPI is a measure of the overall cost of the goods and services bought by

Question

BlackTom AI · Accepted Answer

The CPI measures the cost of a fixed market basket of goods and services purchased by a typical consumer; the Bureau of Labor Statistics (BLS) constructs, computes, and publishes this index.

1) Relevant knowledge points and concepts
- Consumer Price Index (CPI): an index that tracks changes over time in the overall price level of goods and services bought by consumers.  
- Market basket: a representative set of goods and services and their assigned weights reflecting typical consumer spending.  
- Producer Price Index (PPI) and GDP deflator are different: PPI tracks producer-level prices; GDP deflator covers prices of all domestically produced final goods and services.  
- The BLS (U.S. Bureau of Labor Statistics) collects price data, weights, and publishes the CPI (commonly CPI-U for urban consumers) monthly.

2) Step-by-step reasoning
- The CPI’s construction begins by defining a “typical consumer” market basket (based on expenditure surveys).  
- The BLS measures the cost of that basket each period and compares it to the cost in a base period.  
- Because the index reflects consumer purchases and spending patterns, it describes consumer cost-of-living changes rather than producer or firm costs.

3) Example calculation (intermediate steps)
- Suppose the base-year cost of the basket = $500. Current-year cost = $550.  
- CPI = (Cost of basket in current year / Cost in base year) × 100 = (550 / 500) × 100 = 1.10 × 100 = 110.  
- Interpretation: CPI = 110 implies prices are 10% higher than in the base year.

4) Why the correct answer is correct
- The CPI explicitly measures prices faced by consumers buying goods and services in their market basket, and the BLS is the official agency that gathers data and publishes the CPI series.

5) Why other interpretations would be incorrect
- Saying the CPI measures producer prices is wrong (that’s PPI).  
- Saying it measures all goods in the economy is wrong (that’s the GDP deflator).  
- Saying it is not computed by BLS is incorrect for U.S. CPI, which is produced by the BLS.

6) Conclusion
This confirms the correct answer: the CPI measures the overall cost of goods and services bought by a typical consumer, and the CPI is computed and reported by the Bureau of Labor Statistics.

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