Predloga:Inflation

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This template takes a country_code, for example, "US" for the United States or "UK" for United Kingdom, a value in that country's currency, a start_year, and applies to it the country's consumer price inflation until "recently" or another end year.[1] For example, this template calls the U.S. inflation table located in the sub-template Template:Inflation/US/dataset to perform the U.S. calculation. This means that whenever a new year arrives and the inflation tables are updated, all articles using this template have their displayed values updated accordingly.

Alternatively, you can provide a second, optional end_year parameter, and the value will be inflated for the period between the two years, providing a convenient way of getting values from different time periods adjusted around the same date.

Usage[uredi kodo]

{{Inflation|country_code|value|start_year}}
{{Inflation|country_code|value|start_year|end_year}}
{{Inflation|country_code|value|start_year|r=decimals|fmt=c}}
{{Inflation|country_code|value|start_year|r=decimals|fmt=eq}}
{{Inflation|country_code|value|start_year|r=decimals|fmt=eq|cursign=X}}

The supported countries are listed below, with their country_code and minimum start_year:

Country name country_code minimum for start_year
Avstralija[2] AU 1901
Kanada[3] CA 1916
Nemčija[4] DE 1882
Indija[5] IN 1953
Japonska[6] JP 1970
Združeno kraljestvo[7] UK 1264
Združene države Amerike[8] US 1800

Parameters[uredi kodo]

  • country_code (parameter 1) can be: AU, CA, DE, UK, US, UKNGDPPC, etc.
  • value (parameter 2) can have commas, but no currency symbol.
  • start_year (parameter 3) depends on years allowed for each country.
  • end_year (parameter 4), if provided, must be higher (later) than start_year, but not higher than the current year, and will default to "recently" if left out;
  • r=digit sets the digit in which the value must be rounded, defaulting to "0" if unspecified, i.e., without cents (see Tips & Tricks below for details on how to use this parameter).
  • fmt=c will insert commas into the inflated value.
  • fmt=eq will show an equivalent-to phrase.
  • cursign=X will set the currency symbol when 'fmt=eq' is used (default: $).
Examples[uredi kodo]
  • Zelena kljukicaY {{Inflation|US|595|1982}} = 1454
  • Zelena kljukicaY US $595 (${{Inflation|US|595|1982|fmt=c}} today) = US $595 ($1.454 today)
  • Zelena kljukicaY US $595 ({{Inflation|US|595|1982|fmt=eq}}) = US $595 (equivalent to $1.454 in 2019)
  • Zelena kljukicaY {{Inflation|US|800|1942|r=-3|fmt=eq}} = equivalent to $12.000 in 2019
  • Zelena kljukicaY {{Inflation|US|100|2010|2012|r=2|fmt=eq}} = equivalent to $105,28 in 2012
  • Rdeči XN {{Inflation|UK|1|1323|fmt=eq}} = Napaka v izrazu: Nepričakovan znak za ločilo »[«equivalent to ${Inflation} - NaN. check amount: 1 or year: 1.323,  in 2019
  • Zelena kljukicaY {{Inflation|UK|1|1323|fmt=eq|cursign=£}} = Napaka v izrazu: Nepričakovan znak za ločilo »[«equivalent to £{Inflation} - NaN. check amount: 1 or year: 1.323,  in 2019
  • Zelena kljukicaY {{Inflation|DE|100|2000}} = Napaka v izrazu: Nepričakovan znak za ločilo »[«{Inflation} - NaN. check amount: 100 or year: 2000 

Entering invalid parameters will result in a link to the NaN article:

  • Rdeči XN {{Inflation}} = 23
  • Rdeči XN {{Inflation|abc}} = Napaka v izrazu: Nepričakovan znak za ločilo »[«{Inflation} - NaN. check amount: {{{2}}} or year: {{{3}}} 
  • Rdeči XN {{Inflation|DE|1000000}} = Napaka v izrazu: Nepričakovan znak za ločilo »[«{Inflation} - NaN. check amount: 1000000 or year: {{{3}}} 
  • Rdeči XN {{Inflation|US|1000000|1200|3000}} =
    {Inflation} - Year: 1200 lower than US minimum, 1264, for amount: 1000000. 
    {Inflation} - End year: 3000 greater than current year, 2019 for amount: 1000000. NaN
  • Rdeči XN {{Inflation|UK|1000000|2005|2004}} = Napaka v izrazu: Nepričakovan znak za ločilo »[«
    {Inflation} - Start year: 2005 greater than end year, 2004 for amount: 1000000. {Inflation} - NaN. check amount: 1000000 or year: 2005 

Tips & Tricks[uredi kodo]

Currency conversion[uredi kodo]

This template is currency agnostic, which means it doesn't convert between different currencies. Thus, if you wanted to know how much DM 1,000.00 marks in 1960 are worth nowadays, entering {{Inflation|DE|1000|1960|r=2}} would provide a result (Napaka v izrazu: Nepričakovan znak za ločilo »[«{Inflation} - NaN. check amount: 1000 or year: 1960 ) still in marks, not in euros.

Consequently, if you need a result in another currency than the one in which the original value is stated, for now you must do the conversion manually, as in the following example which uses the defined conversion rate of € 1 = DM 1.95583:

  • Zelena kljukicaY {{#expr:({{Inflation|DE|1000|1960|r=2}} / 1.95583) round 2}} = Napaka v izrazu: Nepričakovan operator <

A currency conversion template to ease these conversion tasks is planned. This section will be updated accordingly once it's developed.

Rounding[uredi kodo]

By default the values are calculated to the unit, as for all but very low values cents are undesirable. You can specify rounding with the |r= parameter which determines the number of decimals. To obtain cents use |r=2, but other values can be used, including negative ones: |r=-3, for example, will round to the nearest thousand, |r=-6 to the nearest million, and so on. It is advisable to avoid excessive precision; even if the start value is known to be exact, the template's result will not be because the inflation index tables are rarely accurate to more than about 1%, and a granularity of whole years is used.

Very large results[uredi kodo]

Very large results are expressed in scientific notation ("1.2E+14" instead of "120000000000000") which is normally not desirable. A workaround is to express the value to be inflated with fewer digits, adding a multiplier text such as "trillion" after the result, using the "Show preview" button as many times as needed, changing parameters until the best result is found:

  • Zelena kljukicaY ${{Inflation|US|1000000000000|1900|r=-11|fmt=c}} = $28.300.000.000.000
  • Rdeči XN ${{Inflation|US|10000000000000|1900|r=-12|fmt=c}} = $2,83E+14
  • Rdeči XN ${{Inflation|US|10000000000|1900|r=-9|fmt=c}} thousand = $283.000.000.000 thousand
  • Zelena kljukicaY ${{Inflation|US|10000000|1900|r=-6|fmt=c}} million = $283.000.000 million
  • Zelena kljukicaY ${{Inflation|US|10000|1900|r=-3|fmt=c}} billion = $283.000 billion
  • Zelena kljukicaY ${{Inflation|US|10|1900|fmt=c}} trillion = $283 trillion

The following section provides an automated way of avoiding this trial and error scenario.

Formatprice[uredi kodo]

{{Formatprice}} is a template specifically designed to display price values, both big and small, in a readable way. For example, instead of showing the whole of a huge number such as "953,783,409,856.12", it would show it as "Predloga:Formatprice", while small numbers have their cents part appearing as expected, "1234.5" being properly shown as "Predloga:Formatprice".

Documenting[uredi kodo]

It's a good practice to provide a valid reference for the prices calculated with this template in articles where it's used. The template {{Inflation-fn}} was developed to ease this task. It accepts as its single parameter the same country codes used here, and will generate one or more appropriate footnotes. Typically, this is how a piece of text using it looks like:

  • In 1985 a unit cost on average $1,040. This is {{Inflation|US|1040|1985|fmt{{=}}eq}}}}.{{Inflation-fn|US}}

Resulting in this converted code (notice the footnote link at the end):

  • In 1985 a unit cost on average $1,040. This is equivalent to $2.280 in 2019.[8]

The footnote thus generated appears whenever {{reflist}} or <references /> is used in an article, usually in its "References" section. See below for the live example in this document's own References section, or click the above generated footnote to jump to it.

Limitations[uredi kodo]

  1. Currently it isn't possible to "de-inflate" a value to what it would have been in a previous year. If you need this functionality, please request it at the talk page. Adding it won't be difficult, but there's no point in doing so before someone actually needs it.
  2. Substitution isn't supported at all. Trying to {{subst:Inflation|...}} would only result in a long sequence of embedded parser code without any direct benefit. If you need to obtain an inflated price only once, please use the special ExpandTemplates page then copy the result and paste it at the desired location.

Developer Documentation[uredi kodo]

An inflation series represents templates in the following categories:

  • Predloga:Inflation/name
  • Predloga:Inflation/name/dataset
  • Predloga:Inflation/name/startyear
  • Predloga:Inflation/dok/name (Which is then displayed at Inflation/name/dataset as the documentation, and needs to refer to the original data source)

Modifications need to be made to:

  • Predloga:Inflation-fn

See also[uredi kodo]

Predloga:Math templates

References[uredi kodo]

  1. How recently depends on how the data set for each country is constructed, and on the internal tables being updated accordingly every January. Some data tables provide inflation data up to December 31, 2018, others up to roughly June-July 2018, and others yet up to December 31, 2017.
  2. Australian Consumer Price Inflation figures follow the Long Term Linked Series provided in Australian Bureau of Statistics (2009) 6461.0 – Consumer Price Index: Concepts, Sources and Methods, 2009 as explained at §§3.10–3.11; this series comprises "from 1901 to 1914, the A Series Retail Price Index; from 1914 to 1946–47, the C Series Retail Price Index; from 1946-47 to 1948-49, a combination of the C Series Index, excluding rent, and the housing group of the CPI; and from 1948–49 onwards, the CPI." (3.10)
  3. Canadian inflation numbers based on Statistics Canada. "Consumer Price Index, historical summary". CANSIM, table (for fee) 326-0021 and Catalogue nos. 62-001-X, 62-010-X and 62-557-X. And Consumer Price Index, by province (monthly) (Canada) Last modified 2013-12-20. Retrieved January 8, 2014
  4. German inflation numbers based on data available from Deutsches Statistisches Bundesamt.
  5. Inflated values automatically calculated.
  6. Japansese Historical Consumer Price Index numbers based on data available from the Japanese Statistics Bureau. Japan Historical Consumer Price Index (CPI) - 1970 to 2014 Retrieved 30 July 2014.
  7. UK CPI inflation numbers based on data available from Gregory Clark (2014), "What Were the British Earnings and Prices Then? (New Series)" MeasuringWorth.
  8. 8,0 8,1 Consumer Price Index (estimate) 1800–2014. Federal Reserve Bank of Minneapolis. Retrieved February 27, 2014.