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Real gross domestic product was unchanged in September, after edging down 0.1% in August. Declines were recorded in wholesale trade, mining and oil and gas extraction, as well as in the arts and entertainment sector and utilities. The declines were offset by increases in the finance, insurance and real estate sector, the public sector, and professional and transportation services.

Note to readers

The monthly gross domestic product (GDP) by industry data at basic prices are chained volume estimates with 2002 as the reference year. This means that the data for each industry and each aggregate are obtained from a chained volume index multiplied by the industry's value added in 2002. For the 1997 to 2008 period, the monthly data are benchmarked to annually chained Fisher volume indexes of GDP obtained from the constant-price input-output tables.

For the period starting with January 2009, the data are derived by chaining a fixed-weight Laspeyres volume index to the prior period. The fixed weights are 2008 industry prices.

This approach makes the monthly GDP by industry data more comparable with the expenditure-based GDP data, chained quarterly.

All data in this release are seasonally adjusted. For more information on seasonal adjustment, see Seasonal adjustment and identifying economic trends (http://www.statcan.gc.ca/pub/11-010-x/2010003/part-partie3-eng.htm).

Revisions

With this release of monthly GDP by industry, revisions have been made back to January 2012. In the context of the comprehensive revision to the Canadian System of National Accounts, historically-revised data of monthly GDP by industry are planned for release on January 31, 2013. These revisions will extend back to January 2007 and will reflect conceptual, classification and statistical improvements. For more information about monthly GDP by industry, see the National economic accounts module on our website.

The October 2012 edition, to be released on December 21, 2012, will be the last version of this publication.