You are going to play the following game.
You are one among a group of six players. The players (you included) don't know each other. Moreover, you are put in a cubiculum with a screen in front. Communication will take place only via the screen and keyboard.
At the end of the game, everyone will leave independently, without seeing each other. So, not only you did not know each other before the game, but the same will be true also after you have played.
Everyone receives 20 euro.
He can decide how much of these euro to put in a common pot. The money that he will not put in the pot will remain his.
The decision will be communicated via keyboard, without knowing the choices made by the other five participants.
All of the money collected in the pot will be multiplied by three and then divided evenly among the six participants.
How much do you put in the common pot? (The answers allowed must be an integer number ranging from 0 to 20, extremes included)
Please DO NOT ANSWER before Sunday at noon. Leave room to potential participants to ask questions, further information.
Please answer using the "Spoiler" to allow participants to give their answer without knowing your choice.