Every online shopper has probably experienced it: You’ve added all the items you need to your cart, anda box pops up that says, “You’re only $11 away from free shipping!”

There are many ways to get your stuff shipped gratis. Some retailers offer it to shoppers who spenda certain amount of money; thresholds often fall between $25 and $99. Other stores, such asAmazon, give it to users in exchange for an annual subscription fee. And membersofcash-back site FreeShipping.comcan claim rebates to reimburse their shipping costs.

But consumers’ demand for free shipping comes with at least a few unintended consequences.

Our fascination with free shipping

Shoppers have come to expect free shipping, thanks in part tothe rise of online commerce, says consumer psychologist Kit Yarrow, a professor at Golden Gate University and author of “Decoding the New Consumer Mind: How and Why We Shop and Buy.”


“It’s funny,” she says. “People go to the post office or UPS and they have no trouble paying for shipping fees. They totally understand the value of a shipping fee. But when it comes to buying something, it does not compute for consumers.”

An overwhelming 88% of consumers say free shipping would make them more willing to shop online, according to the 2016 Walker Sands Future of Retail report. Consumers found this perk more persuasive than streamlined returns processes or same-day shipping.

David Bell, marketing professor at the Wharton School of the University of Pennsylvania, says that Amazon Prime is driving the perception that shipping should be free. Among other benefits, Prime providesmembers free two-day and even free same-day shipping on a variety of items for a $99 annual fee. This encourages shoppers to place smaller orders, and more of them, rather than waiting until they wantenough items to qualify for free shipping based on the amount spent.

“If I qualify for free shipping all the time, that’s going to make me order more,” Bell says. “And even if some of those orders the company loses money on, over the life cycle of my orders, they’re making money on other ones, so it probably evens out.”

Retailers can attract more frequent orders with low free shipping minimums, or bigger orders with higher free shipping minimums, hesays.

» MORE: How to use coupons effectively

You may be charged more for free shipping

Retailers that already have high margins — that is, their profit from the sale of anitem comfortably exceeds the cost ofproducing or procuring it — cangenerally absorb the cost of shipping, according to Yarrow. But other stores may raise their prices in order to give online shoppers free shipping.

“Low-margin retailers are saying, ‘Somehow or another we’ve got to get these costs back into the hands of consumers.’ Otherwise they won’t stay in business,” Yarrow says.

Shehas noticed that items eligible for free shippingare often more expensive than those that don’t qualify. She recommends consumers compare prices onGoogle Shopping, which calculates taxes and shipping costs, before making purchases.

We usedthe website to compare prices on the Echo DesignEO30-1720 “Crete” squareembroidery decorative pillow. The lowest price camefrom Macy’s, a store that did charge for shipping. Stores with free shipping on the pillowtended to charge more for the item itself.

For example, in mid-September, Macy’s charged a $27.97 base price with $9.95 shipping for the item, while Bed Bath & Beyond listeda $39.99 base price with free shipping.

Bell, too, recommends vigilance. If a retailer you already frequent begins offering free shipping, check for priceinflation.

You may be paying more for free shipping

Even if a retailer doesn’t charge you more for free shipping, you could be paying more of your own volition.

As Yarrowpoints out, people spend money to get free shipping; it’s tempting to add something else to your virtual cart when you’re only a few dollars from that threshold. But you’ll be spending more than you intended and possibly more than shipping would have cost. It’s rare to find an item thatcosts exactly the difference, so you’ll likely pay more thanthe minimum required for free shipping.

In his research, Bell found that consumers prefer free shipping to a $10 discount on their orders. “I think it’s because people feel like it’s an extra you shouldn’t have to pay for,” he says.

Take free shipping offers with a grain of salt, and if you find yourself throwing things you don’t need into your cart to get no-cost delivery, pause and think it through.

“Just like our grandmas told us, nothing in life is free,” Yarrow says. “Such a bummer, but it ended up being true.”

Courtney Jespersen is a staff writer at NerdWallet, a personal finance website. Email: Twitter: @courtneynerd.

The article Why Free Shipping Isn’t Always Free originally appeared on NerdWallet.

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