EC290 Lecture Notes - Lecture 4: Gdp Deflator, Weighted Arithmetic Mean

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If cpi is positive, prices rice, if cpi is negative, prices have fallen. Inflation is usually the annualized rate of change in either the cpi or the gdp deflator. The value of the final goods and services produced in an economy during a given period. This is a nominal not real concept. One problem that occurs is creating nominal gdp, where if prices rise and there is no change in production, the value of gdp rises. The solution to this is to deflate nominal gdp. Gdp is a weighted average of the output of final goods and services where specific prices serve as weights. If we measure gdp with chain weights, then between each pair of years, the prices used to calculate the level of real gdp are the average price over those two years. Then, we can calculate the growth rate of real gdp between any two years.

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