{% block title %} The experiment {% endblock %} {% block content %}
The experiment is based on the decision situation just described to you, conducted once. You will enter your decisions in the screen in front of you.
You have either 10 or 30 tokens at your disposal. You can keep them for yourself or put them into a project. Each subject has to make two types of decisions in this experiment, which we will refer to below as the “unconditional contribution” and the “contribution table”.
In the unconditional contribution you simply decide how many of the 10 or 30 tokens you want to put in the project.
Your second task is to fill in a “contribution table” where you indicate how many tokens you want to contribute to the project for each possible contribution of the other group member. Here, you can condition your contribution on that of the other group member.
You have to insert how many tokens you want to contribute to the project into each input box – conditional on the indicated contribution by the other member of your group. You must enter a number between 0 and your total number of tokens (either 10 or 30) inclusive in each input box. For example, you have to indicate how much you contribute to the project if the other group member contributes 0 tokens to the project; how much you contribute if the other group member contributes 1, 2, or 3 tokens; etc.
After all participants of the experiment have made an unconditional contribution and have filled in their contribution table, a random mechanism will select one member from every group. For this group member, it is his contribution table that will determine his actual contribution; whereas, for the other group member, it is their unconditional contributions that will determine their actual contributions. You will not know whom the random mechanism will select when you make your unconditional contribution and fill in your contribution table. You must therefore think carefully about both decisions because either could determine your actual contribution. In next page, two examples should make this clear.