Talk:Consumer price index

message: The CPI is a very common measure of prices and has different definitions and uses in different countries. A definitive US-oriented article is correctly referenced from the Consumer Price Index by Countries. This article is US-centric, which is probably fine with the 4.3% of the world's population that live in that country. I am Canadian and I find it distracting to land on US focused material when I am interested searching for something else.  — Preceding unsigned comment added by Jwaustin188 (talk • contribs) 17:07, 20 September 2019 (UTC)
thread_title: Consumer Price Index by Country

message: Actually, RPI and CPI are two different things.
It would seem that RPI and CPI have very different definitions depending on what part of the world you're in. this page should really be divided into geographical variations.
In the UK, RPI and CPI are definitely not the same thing. The Government uses CPI for inflation targetting, and the RPI for things like setting the interest rate on student loans. Does anyone that knows the details of the two systems feel like prising the two apart again?
:- Splash 19:52, Jun 2, 2005 (UTC)
:Seconded - for example, http://news.bbc.co.uk/1/hi/business/5074570.stm shows a figure of 2.2% for CPI and 3% for RPI, so they are evidently not the same thing here in the UK.  Matthew 09:17, 13 June 2006 (UTC)
thread_title: RPI and CPI

message: I think that this should obviously be combined with Consumer Price Index.  I think that Wikipedia should not be case sensitive.
:This undated request seems to have been accomplished by a redirect with initial entry 16 August 2002.  DavidMCEddy (talk) 16:57, 11 April 2013 (UTC)
thread_title: merge with Consumer Price Index

message: Daily Telegraph 04/12/06: 
Contradiction to header section:  "A spokesman for the Office for National Statistics said: "The CPI and RPI are specifically not intended [NOTE] to measure what people often refer to as 'the cost of living'."
Contradiction to UK section: "Although the Bank of England has frequently said that the CPI is an acceptable economic measure for the purpose of setting interest rates, it does not include many major costs for households — most notably [NOTE] council tax and mortgage payments, which were an important part of RPI." Felicitygraham 14:43, 4 December 2006 (UTC)
thread_title: NOTE:  two contradictions to the text

message: Is it published anywhere online?  One would think any article on the CPI would show what is included in it.  Is this index not published anywhere?  Is it a government secret?  —Preceding unsigned comment added by 206.109.195.126 (talk) 06:28, 1 January 2009 (UTC)
thread_title: Any chance of seeing the makeup of an actual market basket of goods?

message: Why do they take out energy and food prices?
"They" presumably means the Bureau of Labor Statistics. Energy and food prices are removed to calculate 'core' inflation (the BLS refers to that measure as 'all items less food and energy').  Core inflation has several meanings, but it is commonly meant to be the underlying trend in price inflation.  Other calculations are possible, and  Comparing Measures of Core Inflation provides an overview of several common definitions.
     Does this make people stop using them?
This question is argumentative and uneducated.
:As is this answer.  — Preceding unsigned comment added by 108.178.100.10 (talk) 20:06, 21 August 2013 (UTC)
thread_title:  energy and food prices 

message: The "U.S. Consumer Price Index webpage" link under 
External Links is not working. I've not tried all links, since I'm primarily interested in the CPI at the moment. 69.6.162.160 16:57, 28 March 2006 (UTC)
replies: text: Worked fine for me.  Monkeyman(talk) 19:04, 28 March 2006 (UTC)
thread_title:  broken link? 

message: What evidence do we have that the CPI is only an urban index? My understanding is that is a wider measure than that. In Australia, rural prices and suburban prices are measured as well. Capitalistroadster 07:01, 3 June 2006 (UTC)
thread_title: Urban index

message: The CPI is revised on a continuing basis to compensate for the introduction of new products and outlets. [1] An example would be that if the price of beef rises, consumers would switch to chicken. This distorts the index because it allows for the continual degration of products that are rising in price in the index until the consumer it represents is living on millet and powdered milk.
:Nowhere is the assertion made that chicken and beef are perfect substitutes --- but they are obvious partial ones.  In substitution of beef-for-chicken-for-millet, there is no "degration" (degradation?) of products: only a re-evaluation of information on scarcity and relative value and a consequent reconsideration of choices.  In developed countries, more consumers are eating more chicken and beef than ever before; indeed, some of them might benefit in terms of cardiovascular health if they were to begin substituting millet (high in protein, fiber and vitamins) and low-fat powdered milk for some of the high-fat fleshmeat they consume!--Jpbrenna 21:55, 14 August 2006 (UTC)
replies: text:  I was of the opinion that substituting chicken for beef was done deliberately to make the CPI lower, so I initially did not agree with the change.  In studying productivity. I did a lot of research to identify reasons why the hours of work to buy a 3 pound chicken fell from 2 hrs 40 minues in 1900 to about 18 minutes by 1998.  Some of the reasons were agricultural mechanization, refrigeration, better transportation and mass distribution, but these happened decades ago and the price of chicken continued to fall.  One of the important reasons was the green revolution which increased crop yields by a factor of between 3 (soybeans) and 5 (most grains) from the early 1940's until the mid 2000s and another was the advances in poultry management.  As a consequence people started to eat a lot more chicken. If you do not adjust for the shift in consumer preference you do not pick up on the ture savings.Phmoreno (talk) 00:58, 29 September 2010 (UTC)
replies: text: There is now a section on "Consumer Price Indices in the United States" that briefly describes weighting including quoting from BEA web sites about the difference between CPI-U, CPI-W and C-CPI-U that attempts to clarify this.  DavidMCEddy (talk) 04:01, 12 April 2013 (UTC)
thread_title:  Horrendously POV 

message: The introductory paragraphs to this article are not very friendly and are, I presume, written from an American perspective.  For instance, the introduction speaks of 'the CPI' when there are slightly different measures around the world, and Core CPI, whatever that may be, reads as though it's specific to one part of the world.  Hence I think this article could do with a cleanup or a 
tag being put on until it is cleaned. Matthew 12:56, 22 February 2007 (UTC)
thread_title:  Countering systemic bias 

message: I've tried to clean up the two new sections added on 'Weighting' and 'Quality adjustment'.  I'm afraid the QA section was just a mess and I could not make heads or tails out of the intent nor could I verify any of the content.  I've left in the weighting section since it could be made legible, but I would greatly appriciate specific references to the numerous 'conclusions' made within the text.  At the moment, both sections felt more like a term paper than a encyclopedia entry.  It would be great to clean them up and get the content in, but let's get it sourced specifically first. Kuru talk 02:01, 8 August 2007 (UTC)
thread_title:  Massive recent addition 

message: According to everything I have read including this article, http://en.wikipedia.org/wiki/Consumer_Price_Index_%28United_Kingdom%29 the retail price index and the consumer price index are completley different things, so why does RPI redirect here?  —Preceding unsigned comment added by Comrinec (talk • contribs) 17:50, 25 May 2008 (UTC)
replies: text: I have reverted the redirect so that Retail price index is now a distinct article. I also added a cite from the UK government that should explain the difference. It does need wikifying, citing and cleanup. -84user (talk) 15:14, 22 October 2008 (UTC)
thread_title:  Why does RPI redirect to the CPI article? 

message: What are "headline CPI rate" and "core CPI"?. --Mac (talk) 12:47, 30 May 2008 (UTC)
thread_title:  Headline and core CPI 

message: The so called "core" CIP that removes food and energy is totally misleading.  Food and energy prices may be volatile but 1) food is one of the most basic human needs and 2) the price of food is largely determined by the price of energy at today's oil prices and 3) we no longer have the ability through technology to bring down the cost of these two components.  The green revolution increased crop yields by a remarkably constant amount from 1944-2000, meaning the percent increase has decreased over time (initially something like 5%, now something like 1%, headed to 0%). The other issue is rising real oil prices due to depletion and much higher production costs.Phmoreno (talk) 01:14, 29 September 2010 (UTC)
replies: text: What do you mean by "3) we no longer have the ability through technology to bring down the cost of these two components?" We have ongoing automation of refineries, process improvements, fracking, and discoveries of new sources of oil, we have a possible change in the source of energy from oil to other alternatives, and we have ongoing advancements in the production of food that is continuing to reduce the production costs per unit of yield. America may soon actually become a net oil exporter, for example. There is no way that that event will occur without affecting the price of oil world-wide. Development is proceeding with aquaponic techniques that marry hydroponics and aquafarming to increase crop yields while drastically reducing external inputs such as feed and water, while also drastically reducing negative outputs, such as polluted waste-water. As the technique is adopted on a larger scale, a variety of fish and vegetables will be available at lower prices. The technique also lends itself to producing fish and vegetables anywhere, meaning that fish and produce can be sourced nearer to markets, reducing the transportation cost component in these products. That said, it is arguable that food and energy costs being removed from "core" CPI is a flawed concept, or purely to produce a comfortingly small number. --108.178.100.10 (talk) 20:27, 21 August 2013 (UTC)
thread_title:  Core CPI removes the wrong items 

message: It has been argued that changes in 1980 and 1990 of how CPI is calculated grossly underestimates the inflation rate and effectively hides the real rate. The benefit to an endebted government would be to reduce its debt obligation to various programs (eg, Social Security) and lenders, where debt is tied to inflation based, potentiall, on CPI, in real value terms of the debt.
http://www.shadowstats.com/alternate_data/inflation-charts  —Preceding unsigned comment added by 190.43.225.11 (talk) 07:58, 22 April 2011 (UTC)
replies: text: This was added and deleted. I re-added it, but with a better cite - Posner's "What Caused the Financial Crisis". --John Nagle (talk) 04:26, 4 November 2011 (UTC)
thread_title:  US alterations of CPI calculation under-represents true inflation rate 

message: Since 2000 or maybe from beginning day of the trade, the consumer price index is always increasing? For example, our house was purchased in 2000 in 70,000RMB, but today it would be valued at 200,000RMB. So I wonder what's the significance of GDP per capita growth? 
While in consumer electronics products, the price is always falling down. 
Can anyone analyze this? And give me an economic living way or even investment scheme.118.123.200.135 (talk) 07:29, 16 July 2011 (UTC)
thread_title:  Consumer price index question? 

message: Re  - these are actually fairly standard and legitimate (hence, not POV), though I would describe these issues more as "difficulties" rather than "criticisms", and yes, the text does need sources.Volunteer Marek 18:26, 14 March 2013 (UTC)
thread_title:  Criticisms 

message: 142.59.138.181 added the following:  
:Real item price($) = (base year price)*(Base year CPI/Current year CPI)
The sentiment may be appropriate that something like this could help communicate to people with a math phobia.  However, I perceive two problems with this:  
# I don't think there is any such thing as a "real" price.  
# The formula seems to have the ratio upside down, because the units don't match (dimensional analysis).  
Accordingly, I'm changing this as follows:  
:Current year price ($) = (base year price) * (Current year CPI) / (Base year CPI).  
DavidMCEddy (talk) 22:20, 16 April 2013 (UTC)
thread_title:  Real item price 

message: Dr. Diewert has reviewed this Wikipedia page, and provided us with the following comments to improve its quality:
We hope Wikipedians on this talk page can take advantage of these comments and improve the quality of the article accordingly.
Dr. Diewert has published scholarly research which seems to be relevant to this Wikipedia article:
*Reference : , & Diewert, Erwin, 2014. "An Empirical Illustration of Index Construction using Israeli Data on Vegetables," Economics working papers erwin_diewert-2014-11, Vancouver School of Economics, revised 11 Mar 2014.
ExpertIdeasBot (talk) 15:00, 4 June 2015 (UTC)
thread_title:  Dr. Diewert's comment on this article 

message: I'm confused:   translates to '"CPI (M)" redirects here. For other uses, see CPI (M) (disambiguation).'  However no such redirect exists, at least when I tested it after seeing it and before writing this.  
I'm therefore reverting it.  "CPI", however, did redirect to this article.  See also Template:Redirect.  
Thanks for your efforts to improve Wikipedia.  User:CodeTalker reverted your change.  If you create other changes that support this, you may want to restore your change.  DavidMCEddy (talk) 21:35, 8 July 2021 (UTC)
thread_title:  CPI (M)