We have three state-wide models: OH, PA, WV. When we combine them as one region (combined model), the transactions between industries in 82% of cases are largest than the summation of transactions in three individual models. In 12% of cases - they are smaller. I believe they should be in all cases larger in the combined model due to between-regional sales captured in the combined model. What is the reason for the transactions in the combine model being smaller than the simple sum between the same industries in OH+PA+WV?
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