As electronic cash registers have become ubiquitous at businesses from coffee shops to convenience stores, so too has the question:"Add a tip?"
"Let's say you already shopped at a restaurant or coffee shop. You're already committed," Meng Zhu, a professor at Johns Hopkins who studies consumer decision-making and marketing, told Vox."When they ask you for something else, you're more likely to comply because you want to be consistent with your earlier decision."
Earn it, don’t just arbitrarily expect it!
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