Economic multipliers are used to assess the impacts on the economy of an exogenous change in final demand or output of a given industry. Based on the Input-Output (I/O) tables released by Statistics Canada, they provide a measure of the interdependence between an industry and the rest of the economy. Multipliers for the Alberta economy have been developed using the Alberta Treasury Board and Finance Input-Output (I/O) model. Impacts are estimated in terms of total output, gross domestic product, employment and labour income. There are two main types of economic multipliers provided in the dataset: 1) Open model (direct and indirect impacts), and 2) Closed model (direct, indirect and induced impacts). Starting with the 2008 publication, a supplemental set of multipliers was added to the dataset: under a Closed model with a “Safety Net”, these additional multipliers incorporate the assumption that new jobs were filled by people previously receiving employment insurance, effectively reducing the amount of additional income spent in the economy. The multipliers are accompanied by commodity supply ratios, which represent the aggregated proportion of the supply that comes from within and outside Alberta for each major commodity group.