The four stakeholders here include, factory owners, local plastic businesses, local people and workers (or potential workers of the factory). Among these stakeholders, the factory owners stand to gain a lot from opening of this plastic factory. Given the potential of exporting the products, there is profit to be made by the factory owners. They may face some resistance from local plastic businesses, but overall they stand to gain from the factory. Local businesses tend to lose out, since cheaper products and better quality may put them out of business (or at least cause them loss). Local people have both positives and negatives from this project. On one hand, they will be able to buy better quality products at lesser price and some of them may be employed by the factory. One the other hand, some of the local residents may be stakeholders in the local plastic businesses and may lose out on revenues or related advantages. In addition, the farmland on which factory will be built may cause local residents to lose out on the farming goods no longer grown on that formerly agricultural land.
Hope this helps.