MRIO and trade flow analysis
I have two questions about MRIO and trade flow analysis. I’ve read some of the papers on the subject that I’ve found online and on the website, but have some specific questions I haven’t been able to figure out yet.
Specifically, it’s not clear to me how the trade flows and RPC’s are estimated for each region in an MRIO model that uses AGGREGATED regions. The more theoretical work I’ve read focuses on how the gravity model is used to estimate all county to county flows for each commodity. What happens with aggregated regions? Are the gravity model calculations rerun for each model including an aggregated region? Is there some kind of weighting of the county to county calculations used without redoing the gravity model?
The second, related question, is if/how it is possible to access the RPC’s and/or inter-regional flow parameters that reflect not only the rest of world interactions with the regions or with one of the regions, but also the flows between the regions included in the MRIO. Accessible either through the menu directly someplace I’ve missed, or through the underlying Access databases?
Thanks for any help.
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Hello, The Trade Flow data provided in the model are for MRIO purposes only, thus it is not viewable. RPCs can be modified directly through the customize screen, but the underlying Trade model is not editable. If you are interested in viewing and using the Trade Flow data, we do sell this as a separate product under a different license based on usage. Please email info@implan.com. In answering your region aggregation question, the Trade data is summed by the regions included in the model. County A imports $100 of grains from County B and $200 of grains from County C. County B imports $300 of grains from County A and $500 of grains from County C. Then, if we combine Counties A and B into a single region, that region will import $700 of grains from County C. The $100 and $300 worth of grains previously traded between Counties A and B no longer need to be traded....so the trade data between those two counties is ignored - it becomes locally supplied. The new RPC for grains will be calculated based on these new import values and new local supply values. By "new" import and local supply values, they are just sums.
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