Wholesale Services Price Index (WSPI)

Detailed information for third quarter 2016





Record number:


The purpose of this survey is to collect and compile data to measure the monthly change in the movement of the price of wholesale services. These prices are combined and chained to form a price index. The estimates are produced on a quarterly basis.

Data release - February 16, 2017


The purpose of this survey is to collect and compile data to measure the monthly change in the movement of the price of wholesale services. These prices are combined and chained to form a price index. The estimates are produced on a quarterly basis. These price data are combined to estimate a price index for the wholesale services sector that can be joined with other business service indexes to provide better estimates of real output and productivity, monitor inflation and feed an important research agenda at Statistics Canada.

Statistical activity

This index is part of the Services Producer Price Index program (SPPI) at Statistics Canada.

The SPPI program develops and produces price indexes for a number of business service categories. This initiative fills an important data gap in the area of economic statistics and has resulted in a more comprehensive set of service price indexes. These indexes allow Statistics Canada to produce more accurate estimates of real-value added (Gross Domestic Product) and changes in productivity.

Reference period: The time period for which the WSPI equals 100; currently this is the year 2013.


  • Prices and price indexes
  • Retail and wholesale
  • Service price indexes

Data sources and methodology

Target population

The target population consists of all statistical establishments on the Business Register (BR) primarily engaged in wholesaling and that are classified to NAICS 41 - Wholesale Trade under the North American Industry Classification System (NAICS), excluding Business-to-business electronic markets, agents and brokers.

Instrument design

Pricing methodologies and questionnaire design were researched and based on internationally accepted practices and improved through consultation and collaboration with industry experts and the Questionnaire Design and Research Center at Statistics Canada.


This is a sample survey with a longitudinal design.

The frame is part of Statistics Canada's Business Register classified to the wholesale sector (NAICS=41). The population is stratified by 5-digit NAICS and by size based on revenue. The sample is allocated to strata by revenue and selected based on probability proportional to size using Sequential Poisson sampling. The sampling unit is establishment.

Data sources

Data collection for this reference period: 2016-10-27 to 2017-01-12

Responding to this survey is mandatory.

Data are collected directly from survey respondents.

Monthly data are collected on a quarterly basis via electronic questionnaire and by mail out, mail back paper questionnaires, while telephone communication (Computer Assisted Telephone Interviewing) is used for non-response and data follow-up. Several follow-up contacts can be made including sending out a reminder fax or letter in order to collect data.

The price of the wholesale service is defined as the margin price, which is the difference between the average purchase price and the average selling price of the wholesale product being priced. It is not a wholesale selling price.

View the Questionnaire(s) and reporting guide(s) .

Error detection

Error detection is conducted both at the time of collection and during post collection processing, using a set of systematized error detection procedures to identify outliers and possible reporting anomalies. Records that fail these edits are reviewed for editing and correction when necessary or edit failure may trigger a follow-up with the respondent.


Non-response or missing prices are imputed using the averages of designated cells from within the same strata.



The Wholesale Services Price Index (WSPI) uses establishment revenues from the Business Register and industry gross margins from Annual Wholesale Trade Survey (record number 2445) as its weighting sources.


Estimates are produced by calculating a weighted average of price relatives by industry, which are chained together to form an index series. The WSPI is a Laspeyres chain linked index, available at the Canada level only.

Quality evaluation

The survey methodology was designed to control for errors and to reduce their potential impact on estimates. The data is subject to collection and processing validations on key variables and most non-essential data. Analysis at the index level is also performed at various stages of aggregation. Qualitative assessment is done using an internationally developed framework for services producer price indexes that considers program elements such as the type of price being used, timeliness and relevance.

Disclosure control

Statistics Canada is prohibited by law from releasing any information it collects which could identify any person, company, or organization, unless consent has been given by the respondent or as permitted by the Statistics Act. Various confidentiality rules are applied to all data that are released or published to prevent the publication or disclosure of any information deemed confidential. If necessary, data are suppressed to prevent direct or residual disclosure of identifiable data.

Revisions and seasonal adjustment

Data for the most recent quarter are preliminary. The previous quarter of the series is subject to revision. The series is also subject to an annual revision released with second quarter data of the following reference year. The indexes are not seasonally adjusted.

Data accuracy

The statistical accuracy of this index depends on price and weight data obtained from sample surveys. Each type of input data is subject to its own errors. Processing procedures for editing and imputation are in place to ensure the quality of data. Consequently, the aggregate indices at all levels are considered to be statistically reliable.

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