Fast food is often viewed as one of the cheapest ways to grab a meal, but some deals that look like bargains may be doing more to boost restaurant profits than to protect consumers’ wallets.At the center of the strategy is a pricing tactic known as the "decoy effect," a psychological phenomenon in which a less attractive third option subtly nudges customers toward a more expensive choice, according to the journal Electronic Commerce Research and Applications.Fast-food chains frequently use this tactic to steer customers toward higher-priced items, Chowhound reported."It’s meant to make the ‘ri...

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