To: Sun Tzu who wrote (264632 ) 5/23/2008 3:27:04 PM From: TimF Respond to of 281500 The issue is to complex for either side to reasonably be called "just plain wrong", but to the extent that anyone has a mistake to correct it is you. The CPI can reasonable be attacked for using rent equivalence rather than the prices of houses, but its not a "just plain wrong" type of thing, as there is some reasonable justification for it. If you disagree with that justification, and want to adjust based on house prices, that only decreases the current inflation rate, because house prices are going down, while rents are generally going up at the moment. In addition, food and energy prices are eliminated from the so-called core CPI, which many economists tend to focus more closely on because they claim food and gas prices are volatile. The CPI includes food and gas prices. There is also an additional stat that exclude them, but most offical adjustments are made off the CPI, or off entirely different stats such as the GDP deflater, or the Personal consumption expenditures price index, not off of the CPI - food and gas prices. In addition while food and gas prices are going up faster than the general rate of inflation, for a long time they did not do so, and in fact typically increased at a lower rate. Another problem with the CPI figures, according to skeptics, is that it doesn't accurately reflect what's going on in the housing market. That's a legitimate concern, but again one which probably causes a higher official inflation rate at the moment, even if it caused a lower official rate at some points in the past. Also most of this is to do counting rent equivalents rather than house prices, which while questionable, has some justification because when you buy a house you are getting both a consumer good and an investment. You could have instead rented and put money in to the stock market. Higher prices for shares would not represent inflation. OTOH I did agree the adjustment is questionable, is is questionable because investment or not, people mainly buy homes to live in, and when the cost of houses goes up, the cost of living for new home buyers goes up (and typically by more than rents go up). If anyone wants to eliminate this particular adjustment, I would not oppose the change. Just remember that at the moment if you make the change you will cause the headline official inflation rate to go down by quite a bit. Also note I'm not defending the CPI as ideal, or perfect, or the best measure possible, or even the best measure available. I'm also not saying that the specific adjustments for changes in the basket of goods people buy, and for changes in quality over time, are necessarily the correct adjustments. What I am defending is the idea that such adjustments should be made, and that if you don't make them at all you will constantly get inflation wrong. If you don't make the quality adjustments you will get an official rate that is too high. If you don't adjust for changes in goods people buy over time, than in some cases you will falsely push the official rate up, and in other times you will pull it to far down. "Did your new model computer come with a 25% discount from last year's price?" Typical computer prices have gone down. Also you are getting more for the money. The exact amount that should be adjusted for this extra quality is not only complex, but to an extent subjective. The idea that some other stat say "shadow stats" gets it right just by making the adjustment equal to zero is silly. Even if the adjustment currently made is too high (and some economists think in general the adjustments are conservative), some adjustment is called for. If your adjustment for additional quality is zero, you will always overstate inflation.