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Consumer Price Index (CPI)
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For any period, a measure of the cost in that period of a standard basket of goods and services relative to the cost of the same basket of goods and services in the base year.
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Price Index
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A measure of the average price of a given class of goods or services relative to the price of the same goods or services in the base year.
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Rate of Inflation
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The annual percentage rate of change in the price level, as measured, for example, by the CPI.
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Deflation
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A situation in which the prices of most goods and services are falling over time to that inflation is negative.
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Core Rate of Inflation
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The rate of increase of all prices except energy and food.
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Nominal Quantity
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A quantity that is measured in terms of its current dollar value.
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Real Quantity
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A quantity that is measured in physical terms--for example, in terms of quantities of goods and services.
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Deflating (A Nominal Quantity)
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The process of dividing a nominal quantity by a price index (such as the CPI) to express the quantity in real terms.
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Real Wage
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The wage paid to workers measured in terms of purchasing power; the real wage for any given period is calculated by dividing the nominal (dollar) wage by the CPI for that period.
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Indexing
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The practice of increasing a nominal quantity each period by an amount equal to the percentage increase in a specifies price index. Indexing prevents the purchasing power of the nominal quantity from being eroded by inflation.
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Price Level
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A measure of the overall level of prices at a particular point in time as measured by a price index such as the CPI.
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Relative Price
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The price of a specific good or service in comparison to the prices of other goods or services.
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Hyperinflation
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A situation in which the inflation rate is extremely high.
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Real Interest Rate
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The annual percentage increase in the purchasing power of a financial asset; the real interest rate on any asset equals the nominal interest rate on that asset minus the inflation rate.
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Nominal Interest Rate (Market Interest Rate)
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The annual percentage increase in the nominal value of a financial asset.
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Inflation-Protected Bonds
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Bonds that pay a nominal interest rate each year equal to a fixed real rate plus the actual rate of inflation during that year.