Tight Budgeters Beware: Skip Coffee Before Shopping


, they found that shoppers who drank a cup of complimentary caffeinated coffee prior to roaming the stores spent about 50 percent more money and bought nearly 30 percent more items than shoppers who drank decaf or water.

“Caffeine, as a powerful stimulant, releases dopamine in the brain, which excites the mind and the body. This leads to a higher energetic state, which in turn enhances impulsivity and decreases self-control,” said lead author Dipayan Biswas, the Frank Harvey Endowed Professor of Marketing at USF.

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“As a result, caffeine intake leads to shopping impulsivity in terms of a higher number of items purchased and greater spending.”

The experiments consisted of setting up an espresso machine at the entrances of a retail chain and home goods store in France and a department store in Spain.

Upon entry, more than 300 shoppers were provided a complimentary cup – with about half offered coffee that contained about 100 mg of caffeine and the others decaf or water. They then shared their receipts with the researchers as they exited the stores. The team found that caffeinated individuals purchased a significantly higher number of items and spent more money compared to those who had decaf or water.

Researchers found that caffeine also impacted what types of items they bought. Those who drank caffeinated coffee bought more non-essential items than the other shoppers, such as scented candles and fragrances. However, there was a minimal difference between the two groups when it came to utilitarian purchases, such as kitchen utensils and storage baskets.

They set up the fourth experiment in a lab and received similar results, this time regarding online shopping. They split the study pool of 200 business school students between individuals who consumed caffeinated and decaffeinated coffee and asked them to pick which items they’d purchase from a preselected list of 66 options.

Those who consumed caffeine picked more items considered to be impulsive purchases, such as a massager, while others selected more practical items, such as a notebook.

“While moderate amounts of caffeine intake can have positive health benefits, there can be unintended consequences of being caffeinated while shopping,” Biswas said. “That is, consumers trying to control impulsive spending should avoid consuming caffeinated beverages before shopping.”

Source: Eurekalert

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