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The article presents a study on the pattern of commercial paper (CP) on different trading days in Taiwan. The study utilizes the distribution-free stochastic dominance (SD) theory to determine if the day-of-the-week effect, also known as the weekend effect, exists and if the changes in trading days affect the pattern of CP. Results reveal that higher returns of CP appear on the day prior to the last trading day and SD theory can be used as investment strategy to enhance the investors' wealth.