Income is the single most useful indicator of the economic well-being of Canadians. Relevant income data are required for most socio-economic analysis. Governments use income statistics to develop income support programs and social services, such as the Canada Child Tax Benefit, Employment Insurance, provincial income supplements, and welfare payments. They also use these statistics to ensure that programs supplementing family incomes do so efficiently and to identify specific geographic areas that need assistance. Businesses, large and small, use these statistics to locate stores near consumers and to develop new products and services. Private sector and public sector researchers as well as academics often make use of earnings data from the census to study labour markets and industrial patterns. The income and earnings data are based on 2005 constant dollars (denoted by 2005$), whereby constant dollars are derived by applying a price deflator to convert expenditures displayed in a time series to a price level that existed at a certain point in time (the base year).