Contribution analysis clarification

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    ScottL
    You modify the commodity production so that no other industry produces it. Recall that industries can produce more than one commodity. If you don't make this change, you might get other industries making that commodity and that results in a larger output impact than actually exists. The econometric rpc was used in Version 2 as that was all we had, once the trade model came on-line we really stopped using it except for zip code level models. I'll try to find some documentation in the archives.
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    Tim J.
    We are developing a survey to conduct a contribution analysis for Railroads. Here is what we would like to do: it would be nice to find out how much money the railroad charged its customers and put that amount into IMPLAN as a cost for the customer's respective industry. We would do this in hopes that there would be an amount of jobs relative to that cost as well as an output. Is there a way to do this?
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    DougO
    When you plug in an industry sales value (total revenue charges), the softwrae automatically calculates the direct employment based on the model's output per worker. If you are modelling at the National level you have no problem. However, at a regional level, how the transportation revenues get assigned to a given region is a tricky question. A corporate headquarters may collect the money, but where along the rail line from origination to destination is the employment stationed that produces output (maintains the rails, purchases the diesel, maintains the trains, loads and unloads, runs the trains)?
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    Tim J.
    ok. I guess I explained it not proper enough. The thing is, we do not have any data regarding sales, output, etc. Our available data are just the rail-related costs of the customers of the rail company. (In other words, we just know what the customer is paying to the rail company). How can we use these data for IMPLAN? Is it possible to use costs instead of sales, employment, etc.?
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    DougO
    For a service sector such as transportation, gross output equals gross revenues. The total value of production is what the customers are willing to pay for it.
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