Why equal splitting costs you money
Revolut’s default is equal splitting. Tap, divide, done. But equal splitting has a well-documented cost.
In 2004, economists Uri Gneezy, Ernan Haruvy, and Hadas Yafe ran a field experiment at restaurants in Tucson, Arizona. They randomly assigned 258 diners to either pay individually or split equally. The result: diners who split equally ordered 37% more than those who paid for their own meals.
”When the cost is split, diners consume such that the marginal social cost they impose is larger than their own marginal utility.”
Gneezy, Haruvy & Yafe, The Economic Journal (2004)
The researchers called this the Unscrupulous Diner’s Dilemma — a game-theory scenario where rational self-interest leads everyone to overspend because the cost is diffused. When 80% of participants were given the choice, they preferred to pay individually. But when forced to split equally, they compensated by ordering more.
Revolut’s equal-split default enables exactly this dynamic. The app makes it easy to divide the total — but it has no mechanism to ensure the division is fair. For the full research on why fair splits matter, the evidence is clear: itemised splitting eliminates the 37% overspend.
Source: Gneezy, Haruvy & Yafe, “The Inefficiency of Splitting the Bill,” The Economic Journal (2004).