A typical petrochemical complex has two distinct parts of operation: a petrochemical cracker and a few polymerization plants. There are also companies in TX that have only a cracker or only a polymerization plant(s). Using IMPLAN's rule, if we model a petrochemical complex that produces ethylene and propylene out of a cracker and then completely consumes these products to create polyethylene and polypropylene by the polymerization plants, we include all employment of the complex into a highest industry of operation (sector 166 -Plastic materials and resin manufacturing), let's say 550 people (average size of such a complex). If we model just a first part of that plant, a cracker (or a different company that has only a cracker), we would include a part of that employment, typically 200 people (out of 550) into a sector 161 - Petrochemical manufacturing. If we model 550 employees - whole complex- via 166, the total employment impact is 3,080. If we model just part of that complex - 200 employees via sector 161, the total employment impact is 4,220! How does the model account for relationships between industries 166 and 161 if they are part of the same enterprise?
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