Fellow
Shortrunners,
This Wednesday, the Bureau of Labor Statistics (BLS) released the most commonly watched indicator of inflation in the United States, the Consumer Price Index, for the month of June. As I mentioned in passing last week, the CPI is an important figure in that it directly affects the economy because it is used in the formulation of COLAs, or Cost of Living Adjustments (inflation indexation). Not only does the CPI influence COLAs for programs like Social Security, it is also heavily influential in the financial markets, determining the yield on inflation indexed securities. The CPI index, however, is unique from other indexes because it is so employed. Various agencies which produce economic statistics will update the entire series to incorporate new data, new statistical methods, or other benchmark revisions. Because payments are indexed to the CPI, benchmark revisions (those applicable to the entire series) are not easily incorporated, as they would cause too much confusion. Instead, data is revised during the next three months after it is released. What is essentially a four month window is then used to make the data released as accurate as possible. The CPI was not originally intended to be a measure of the cost of living; it was meant to be a measure of the price level. The index, like any other, is imperfect. The price level is determined by looking at a fixed basket of constant quality goods (some 80,000 are looked at by BLS), and each good is weighted by the chance that a consumer would purchase it. This type of index is known as a Laspeyres index and has come under criticism recently because it is said to overstate inflation. The CPI, it has been argued, overstates inflation (even if only slightly) because it can't properly take into account quality change (i.e., there is quite a bit of difference between a $1000 computer purchased in 1990 and a $1000 computer bought in 2000). Second, changes in consumer preference and taste cannot be perfectly measured by the index. This is because the basket (a typical set of goods) is fixed for a period of time. For the great majority of its history (the CPI was officially introduced in 1978, but the US government has been collecting data on the price level since the late 1800's), the CPI has existed in this form. In 1997, advances in data collection and larger budgets allowed statisticians to take advantage of better methods. One such method for measuring change in an index was developed by the economist Irving Fisher in 1922. Today, BLS has created a new CPI, released as "An Experimental CPI with Geometric Means," and this index is a chain-weighted fisher index, meaning that it incorporates changing consumption in a more accurate manner. Simply put, the new series provides a more accurate measure of inflation. These statistical advances have been applied to a range of economic statistics. However, the CPI has been unable to incorporate the change into its historical data because of its use for indexation. As such, historical data for inflation will remain slightly overstated. Does it make any difference? Although its been a big issue both economically and politically, it probably does not matter. Contemporary thought estimates that inflation has been overstated by 1/4th of 1% each year. Economists can get revised data in a new series, so they can still employ the more accurate results. Furthermore, those receiving benefits for social security and other COLA programs benefited from the slightly overstated changes in cost of living. An interesting side note is that the CPI revisions have in a way "helped" to lower the recorded levels of inflation in the United States. Praise for our current chairman Greenspan has been largely due to his ability to fight inflation in the US. Fortunately for him, statistical improvements have made his job all that much easier, lowering recorded levels of inflation.
Sincerely,
Daniel Hicks Economic Releases The data section provides charts and data for the most important economic indicators. Business Inventories: 0.0%
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