You did not withdraw, but 66.66666666666667 % withdrew, while the threshold was 0.0 % . As a result, your payoff is 0.0 .
Instructions
9
You and your classmates each have $10.0 in the bank. The bank keeps 0% of all deposits on hand as reserve.
Each of you decides independently and simultaneously each round whether you want
to withdraw your money or not.
If none of the players withdraw their money, the bank remains solvent and you will get your initial deposit of $10.0 back as well as $10.0 of interest.
If any of the players withdraw, the bank becomes insolvent and all players lose their deposit and get a payoff of $0.