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Nonetheless, a number of economists have been surprised to observe that consumers aren't very happy despite signs that the inflation rate is on a trajectory towards the Federal Reserve's target of two percent. Although a number of economists have been quick to dismiss consumer pessimism or explain that things are actually quite good, a recent paper by economists at Harvard and the IMF offers an explanation for pessimism: perhaps consumer measures of the cost of living differ from the price indices that economists use to measure inflation.
A price index is just a weighted average of prices. People often reference the price index as capturing "the cost of living." This is indeed the purpose of constructing a price index. Economic theory demonstrates that a measure of the cost of living should track the cost of a basket of goods that provides the consumer with the same level of satisfaction across time. If done properly, this price index not only tracks the average behavior of prices over time, but also tracks the cost of living.
Of course, the construction of a price index is easier said than done. For example, inflation occurs when the supply of money grows faster than the demand for money. Prices could be changing because the money supply is growing too fast. However, supply and demand also fluctuate over time, which results in changes in (relative) prices and quantities. A price index needs to isolate the general trend in money prices from changes in relative prices. In addition, there is a question of what to include in the price index.
A long-standing criticism, first articulated by economists Armen Alchian and Ben Klein, is that the price indices that are used by economists and policymakers exclude interest rates and/or asset prices. Conventional price indices are only consistent with economic theory if we believe that consumers are making once-and-for-all consumption decisions. In reality, consumption today affects consumption in the future. Decisions about what to consume today are influenced by the rates of return on particular assets, the cost of borrowing, and asset prices. As such, these prices should be included in our price indices.