Consumer Price Index (CPI)
The Consumer Price Index (CPI) measures the general level of prices consumers pay for goods and services, including consumption taxes. The specific basket of items is chosen to reflect the spending of a typical household. For this reason, the percentage change in the CPI, known as CPI inflation, is often used as a measure of changes in the 'cost of living'.
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Consumer Price Index (CPI)
An economist wants to measure the change in the cost of a 'standard grocery run' between two years.
- In Year 1, the basket consists of 1 loaf of bread ($3), 1 gallon of milk ($4), and 1 dozen eggs ($2). The total cost is $9.
- In Year 2, the economist observes that bread now costs $4 and milk costs $3.50. They also notice that many people are now buying a half-dozen eggs for $1.50 instead of a full dozen. The economist calculates the new basket cost as $4 (bread) + $3.50 (milk) + $1.50 (half-dozen eggs) = $9.
The economist concludes that there has been no overall change in prices. What is the fundamental error in this approach to measuring the change in the general price level?
Applying the Shopping Basket Method
Critique of a Price Level Calculation
To accurately measure the change in the general price level between two periods using the 'shopping basket' method, the quantities of goods and services in the basket should be adjusted in the second period to reflect the most current consumer purchasing habits.
A researcher wants to measure the change in the overall cost of typical household expenses in a town between last year and this year. Arrange the following steps in the correct logical order to accurately apply the 'shopping basket' method for this purpose.
Evaluating a Method for Price Measurement
An economist is using the 'shopping basket' method to measure the change in the general price level between two years. Match each action taken by the economist with the correct description of its purpose or validity within this method.
A simple shopping basket is defined as containing 2 loaves of bread and 1 gallon of milk. In a base year, the total cost of this basket was calculated. In the following year, the price of bread is $3.50 per loaf and the price of milk is $5.00 per gallon. To measure the change in the general price level, the cost of this identical basket in the following year would be $____.
Calculating Price Changes for a Town's Representative Basket
Interpreting Price Changes with a Fixed Basket
Learn After
Definition of Real Wage
Constructing a Consumer Price Index
Composition of the CPI Basket
Weighting of Items in the CPI Basket
Treatment of Imports and Exports in the CPI
Steps to Calculate the Inflation Rate
Quality Adjustment Challenge in Economic Measurement
Causes and Impact of the 2021-2022 Global Inflation Surge
Suppose the price of a standard smartphone, a key item in the fixed basket of goods used to measure consumer prices, increases by 20% in one year. In that same year, the new standard model includes a significantly better camera, a faster processor, and longer battery life. Based on this information, what is the most accurate evaluation of how this price change affects the measurement of the cost of living?
Calculating Inflation in a Simplified Economy
An economist is tasked with creating a price index to measure the change in the cost of living for a typical urban family. Which of the following approaches best aligns with the methodology and purpose of the Consumer Price Index (CPI)?
Consider an economy where the following events occur simultaneously: (1) The price of imported coffee, a popular beverage, rises by 15%. (2) The price of domestically manufactured jet engines, sold to airplane manufacturers, falls by 10%. (3) The government increases the sales tax on clothing, which consumers pay at the point of purchase. Which of these events will be directly captured in the calculation of the Consumer Price Index (CPI) for that period?
Evaluating a Price Index's Accuracy
CPI vs. Personal Cost of Living
In a simplified economy, the basket of goods used to measure consumer prices consists of only two items: Housing (which makes up 70% of a typical household's budget) and Movie Tickets (which make up 5% of the budget). In a given year, the price of housing increases by 2%, while the price of movie tickets increases by 20%. Which statement best describes the resulting change in the overall price index?
A major technological innovation makes solar panels significantly cheaper and more efficient. As a result, a large number of households switch from using natural gas for heating to using electricity generated by their new solar panels. The basket of goods used to measure consumer prices, which was last updated five years ago, gives a significant weight to natural gas but does not include residential solar panels. How would this shift in consumer spending patterns likely affect the accuracy of the price index as a measure of the change in the cost of living?
The Consumer Price Index (CPI) is designed to measure the change in the cost of a fixed basket of goods and services that a typical household consumes.
CPI and Demographic Spending Patterns
CPI as a Measure of the Cost of Living
The 'Typical Household' in CPI Calculation
Inclusion of Consumption Taxes in the CPI