Why is a dollar buying less next year a completely different claim from preferring a dollar today?
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Impatience versus purchasing power
Record the distinction between the preference for money now and a claim about what a dollar buys, state that inflation runs in either direction, and note the 2008 energy-price path.
Wealth paired with the price index
State that consumption rather than a wealth total measures how well off you are, write the pairing of with the basket price , and list what the basket holds.
Cost of living
Write the ratio of the index levels at and as a constant growth rate per period, and record that is only a variable name for the inflation rate.