1. the time limit for a query. 2. a sample of the people of Thailand and foreigners will differ, for example, the average income level for foreigners a month higher than people in Thailand, but the study didn't show against living or inflation of each country make the adidas is expected to move its study results. 3. research related to the lack of references from past research that did not involved directly. 4. the issue of a sample of someone not used to machine registers. automatic manually, but the employees who check in to. Therefore, it is possible to reduce the number of those samples into it because it is not possible to distribute questionnaires, sample group.
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