MULTIPLIER
How are TYPE III multiplier calculated for aggregated sector?

The IxI SAM is the basis of the multipliers. It can be found via Industry Accounts > IxI Input Output Accounts > Export > Full Detail IO Accounts. You will have to create a PivotTable in Excel to properly view the matrix. With the Type I multiplier, only industries (sectors 1440) are endogenous. The Type SAM multiplier includes Type I plus whichever institutions are selected; the default selects just the household sectors, which include the nine household institutions and Labor Income. Households are endogenized as part of the multipliers (i.e., treated as an industry) because we recognize that labor income is not a leakage and needs to be incorporated as part of the rounds of expenditures that create an impact. Of course, leakage due to incommuting needs to be accounted for. The Type SAM multiplier is described in these papers: https://implan.com/v4/index.php?option=com_docman&task=doc_download&gid=137&Itemid=7 and https://implan.com/v4/index.php?option=com_docman&task=doc_download&gid=127&Itemid=7. The Type SAM multiplier uses more information than the Type II so it is more consistent with reality. The Type SAM incorporates both the Household and Labor Income as both rows and columns, and thus allows for direct tax payments and commuting, which the Type II does not. The Type SAM with the households internalized is considered the best conservative estimate and maximizes the use of the social accounts detail available in the model. The Type III multiplier has not been the multiplier of choice since the DOS version of IMPLAN written by the Forest Service, and is not longer an option in Version 3. Basically, the Type III multiplier used population change as a driver for the induced effect, so all jobs were treated equally (e.g., a McDonalds worker had the same induced impact as a medical doctor). With the Type II and Type SAM multipliers, income is the driver, such that the higher the worker's income, the larger the induced effect. If you are wanting to calculate the Type SAM Multiplier for an aggregated model, you have two options. If you aggregate the model (Options > Aggregation), the multipliers in the multipliers report (Explore > Multipliers) will be in terms of your aggregated sectors. However, we always encourage analysis to be done at the most disaggregate level possible to avoid aggregation bias. You can then aggregate the results to your chosen aggregation if you'd like and then calculate multipliers by dividing the total effect by the direct effect. 
Thank you for the information. As I am going to compare my study results with the previous one (that has calculated Type III multiplier), I need to calculate them anyhow. Therefore, is there anyway to calculate them in version 3? or what might be the other way to estimate them? Thanks. 
Thank you for you information. I am confused in calculating single SAM multiplier for the aggregated sector. I wish to calculate at disaggregated level. So which one of the following is true? 1. Shall I divide total impacts (sum of [u]aggregated sector only[/u] that is calculated from scenario results) by the direct impacts of that aggregated sector. 2. Shall I divide total impacts (sum of [u]all sectors[/u] that is calculated from scenario results)by the direct impacts of that aggregated sector. 3. Shall I divide total impacts (sum of all sectors that is calculated from scenario results)by the direct impacts of that aggregated sector [u]obtained from the study area report[/u]. Or, what is the true formula to calculate the single SAM multiplier for the aggregated sector. Thank you.
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