Also interesting ...
"According to the NPD Group, which does research on consumer marketing, single dinners leave an average tip of 19.7 per cent. That number drops to 16.9 per cent for two people, 15.2 per cent for three, 15.9 per cent for four and 13.2 per cent for five.
Researchers have theorized that a phenomenon known as diffusion of responsibility may account for the downward slide."
This explains the tip added to the bill for large parties. I wonder what would happen if someone refused to pay it.
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