What do we know about tipping?
1. Two studies show little relationship between quality of waiter service and size of tip.
2. Hotel bellboys can double the size of their tips, on average, by showing guests how the TV and air conditioning work.
3. Tipping is less prevalent in countries where unease about inequality is especially strong.
4. The more a culture values status and prestige, the more likely that culture will use tipping to reward service.
5. Tips are higher in sunny weather.
6. Servers can increase their tips by giving their names to customers, squatting next to tables, touching their customers, and giving their customers after-dinner mints.
7. Drawing a smiley face on the check increases a waitress's tips by 18 percent but decreases a waiter's tips by 9 percent.
8. In one study, waitresses increased their tips by 17 percent by wearing flowers in their hair. In general it pays to look distinctive albeit not freaky.