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Correcting Statistics for Inflation

Learn how inflation skews GDP measurements and how to correct for it using the Consumer Price Index (CPI), Producer Price Index (PPI), and GDP Price Deflator. Understand the impact of inflation on purchasing power and the reliability of GDP statistics.

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Correcting Statistics for Inflation

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  1. Eco 13/2 Correcting Statistics for Inflation

  2. Inflation • GDP can be unreliable because it doesn’t take into account unpaid work or depreciation. • Inflation also skews GDP. Inflation is the prolonged rise in the general price of level of goods andservices.

  3. The Purchasing Power of Money • Inflation lowers purchasing power, the real goods and services it can buy. A dollar can’t buy thesame amount as it did before. So how does inflation skew GDP?

  4. Last year, an ice cream cone cost $1.00. Now, it cost $1.50. The same amount of ice cream was produced, it just cost more. Inflation and GDP

  5. Measures of Inflation • Gov’t measures it in several ways: • Consumer price index • Producer price index • Implicit GDP price deflator

  6. Consumer Price Index (CPI) • Every month the gov’t measures the change in price of a specific group of goods and services that the average household uses. • This “market basket” includes 80,000 specific goods and services under food, housing, transportation, apparel, recreation, medical care, personal care.

  7. CPI 1999 2000 2001 • Food 164.1 167.8 173.6 • Clothing 131.3 129.6 127.3 • Housing 163.9 169.6 200.6 • Medical 250.6 260.8 272. 8

  8. Base Year • Gov’t compiles the CPI monthly. • Start with a base year (year used as a point of comparison for other years in a series of statistics. • Base year is actually an average between several years and is given the value of 100.

  9. Base Year Ex: Base year 1982-1984. For 2001, CPI is 177.1 Then the average price of goods and services in the market basket has risen 77.1% since 1982-1984 See figure 13.5

  10. Producer Price Index (PPI) • PPI is a group of indexes that measures the average change in prices that US producers charge their customers. • The PPI, then, is from the producers’ perspective.

  11. Producer Price Index (PPI) • Most of the producer prices included in the PPI are in mining, manufacturing, and agriculture.

  12. Producer Price Index (PPI) • PPIs usually increase before the CPI. A baker who pays more for ingredients will pass on the added cost to the consumer. So changes in the PPIs are a hint that inflation and CPI will increase.

  13. GDP Price Deflator • This index removes the effects of inflation from GDP so that the overall economy in 1 year can be compared to another year. • When the price deflator is applied to GDP in any year, the new figure is called real GDP. • Real GDP: GDP adjusted for inflation.

  14. GDP Price Deflator • Gov’t uses 1995 as the base year to measure real GDP. Each year the price deflator is used to change current, or nominal GDP into real GDP. Ex: GDP in current dollars for 2002

  15. GDP Price Deflator Ex: GDP in current dollars for 2002 was $10,446.2 billion. To find real GDP for 2002, the gov’t divides 2002 GDP by the 2002 price deflator (110.66) and multiplies the result by 100. $10,446.2/110.66 x 100 = $9,439.9 (in billions) This figure can be compared to 1996 nominal GDP of $7,813.2 billion.

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