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The research showed that the effect of caffeine is stronger for “high hedonic” products such as scented candles, fragrances, décor items, and massagers and weaker for “low hedonic” products such as notebooks, kitchen utensils, and storage baskets. The study found that drinking a caffeinated beverage before shopping leads to more items purchased at the store and increased spending. Caffeine is also found in energy drinks, chocolate, and in many over the counter and prescription medications. More than 80 percent of Americans consume at least one caffeinated beverage every day with coffee being the primary source of caffeine, followed by tea and soda.