The next time you see an online offer or go to the grocery store, notice whether there are two choices or three. A common marketing trick is to present three choices: The third choice is designed to shift your attention toward the more expensive product. For example, given a small cup of coffee for $3 or a large cup for $5, most choose the smaller cup. But when a third, medium-sized cup costs $4.50, most end up buying the $5 cup, because it suddenly looks like a bargain. Similar setups influence everything from travel decisions to voting behavior.
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Source: Phys.org