Why you keep waiting too long
If early is better, why do most people ask late? Behavioral psychologists Yaacov Trope and Nira Liberman at New York University studied how people think about future versus immediate events, publishing their findings in the Journal of Personality and Social Psychology in 2003.
Their finding: people think about distant events abstractly and near events concretely. When you sit down, “splitting the check” is an abstract future problem. By the time the check arrives, it is an immediate concrete problem---and suddenly feels awkward. This is called construal level theory, and it explains the procrastination gap in payment requests.
73%of diners intend to ask early but delay, per NRA survey data
48%overestimate how likely requests are to be rejected, per Bohns (2016)
2.3xmore likely to stay silent once the check arrives, per Read & Loewenstein (2001)
Vanessa Bohns, a social psychologist at Cornell University, adds a critical layer. Her 2016 review in Current Directions in Psychological Science documented that people dramatically overestimate how awkward requests will feel. Across multiple studies, participants expected far more rejections than they actually received---the anticipated discomfort of asking is almost always worse than the reality.
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People systematically underestimate others' willingness to comply with direct requests. The anticipated awkwardness of asking rarely materializes---but the cost of not asking is entirely real.
Vanessa Bohns, Cornell University, Current Directions in Psychological Science, 2016
The solution is what behavioral economists call pre-commitment. Dan Ariely and Klaus Wertenbroch at MIT demonstrated in their 2002 study in Psychological Science that people who commit to actions before the anxiety-inducing moment are dramatically more likely to follow through. Their finding applies directly here: decide you will mention separate checks when you sit down---before you can talk yourself out of it.
Sources: Trope & Liberman, Journal of Personality and Social Psychology, 2003; Ariely & Wertenbroch, Psychological Science, 2002; Bohns, Current Directions in Psychological Science, 2016