Contribution Analysis will show the impact of your industry on the regional economy. This can be conducted as a Single or Multi-Industry Analysis. However, a Multi-Industry Contribution Analysis can only be performed with IMPLAN Pro. This article will provide the mechanics on conducting a Single Industry Contribution Analysis.
In the Model Overview screen menu select Study Area Data.
Scroll through the sheet to find the IMPLAN sector you are modeling. Record the total Output value. (e.g. For 2013 Washington County, MN, Sector 139 Wood Windows and Doors has a total Output of $401,225,433).
Find the current Detailed Multiplier for the Industry sector you are modeling (not the summary multiplier).
Select the Detail Multipliers tab and then change the drop-down menu to the sector you are modeling. The screen should update to reflect the Multipliers contributing to the selected sector. Record the Type SAM Multiplier for your Industry Sector. (For 2013 Washington County, MN, When Sector 139 Wood Windows and Doors is selected in the drop-down menu, the corresponding SAM Multiplier for Sector 139 is 1.00093806). This DetailedType SAM Multiplier tells us how a specific industry responds to an impact on itself. In a contribution analysis, we want to calculate a Final Demand value such that, using this detailed multiplier, the total output impact on that industry equals its historical output for that year.
Calculate the reciprocal of the Multiplier.
- Divide 1.0 by your Multiplier from the step above. (For 2013 Washington County, MN, When Sector 139 Wood Windows and Doors this would be 1.0/1.00093806 = .999062)
- Multiply the reciprocal value by the region's Total Output for your study sector. (For 2013 Washington County, MN, Sector 139 Wood Windows and Doors this would be 0 .999062*$401,225,433= $400,849,412)
Set the Industry Sales number to (For 2013 Washington County, MN, Sector 139 Wood Windows and Doors this would be $400,849,412).
Create a Scenario by selecting the Scenarios tab
Select Add Scenario
Select the Activity to be analized in the Available Activities box and click the right arrow. This will transfer the Activity from the Available Activities box to the Selected Activities box.
Select Update Scenario
Select Analyze Single Region
- Go to the Detail Results tab, and select the Output tab. Total Output for the sector should be close to or identical to the Total Sector Output recorded from the Model Overview Screen (for 2013 Washington County, MN, Sector 139 Wood Windows and Doors this would be $401,225,433).