How Amazon and Walmart’s next-day shipping could bust your budget

Free next-day shipping could make a shopper out of you.

Amazon AMZN, -4.64%recently announced it had begun free one-day delivery nationwide for Prime members, who pay $119 per year, with no minimum-purchase threshold. Walmart WMT, +0.51% said it would introduce free “NextDay” delivery on 220,000 commonly purchased items. But consumer psychologists say you should think twice before clicking buy, as the “free shipping” option and instant gratification will make you even more likely to spend.

“Next-day delivery causes shoppers to buy more items, and to buy items more often from the retailers,” said consumer psychologist Bruce Sanders, author of the book “Retailer’s Edge.

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