**Appendix A. Survey Instructions**

Q1: I would really appreciate your help in collecting data for my bachelor thesis. Completing this survey will only take a few minutes and you will have the chance to earn up to DKK 400 by answering seven survey questions. I will randomly draw 7 participants, who will get paid according to their choices. This will be explained in the survey. My name is Markus Seier and I am studying Economics. Your participation is voluntary. I will analyze the data in anonymous format. The email address that you can provide at the end of the survey will only be used to contact you in case you are among the participants drawn to receive a payment. Payments will be made by mobile pay. I will delete the email address as soon as payments are completed.

Q2: First, you complete four tasks regarding "division of money". Your decisions in these tasks determine your earnings if you are randomly drawn to be paid for answering this survey. If you are drawn to be paid for a particular question, you are paid according to your choices and the choices of the other participants with whom you are randomly matched. You can be drawn to be paid for multiple questions. After completing the four above-mentioned tasks, you proceed to the second part of this survey with three short questions. Lastly, you are to indicate your gender, at which faculty you study and provide your email address if you want to have a chance of getting paid up to DKK 400. Please continue to the next page where you are to complete four different tasks regarding division of money.

Q3: You are matched with another participant of this survey. You are given DKK 100 and must decide on how much to offer the other participant. You act as the "proposer". You earn DKK 100 subtracted what you have offered and the other participant earns what you have offered him/her. How much do you give to the other participant? Remember that you and the other participant will actually be paid according to your decisions if the computer draws your names.


Q4: You are matched with another participant of this survey. You are given DKK 100 and must decide on how much to offer the other participant. If the other participant accepts your offer, you earn DKK 100 subtracted what you have offered and the other participant earns what you have offered him/her. If the other participant rejects your offer, you both earn DKK 0. How much do your offer the other participant? Remember that you and the other participant will actually be paid according to your decisions if the computer draws your names.


Q5: You must now decide whether to accept or reject an offer from another participant. The other participant is given DKK 100 and must decide on how much to offer you. If you accept, you earn what the other participant offered you and the other participant earns DKK 100 subtracted what he/she offered you. If you reject, you both earn DKK 0. What is the minimum offer, you are willing to accept? Remember that you and the other participant will actually be paid according to your decisions if the computer draws your names.


Q6: I will randomly draw a pair of participants, from the first question, were the participant endowed with DKK 100 (the "proposer") chose to give DKK 0 and keep the DKK 100 for him/herself. You are given DKK 50 and can reduce the earnings of the proposer who chose to keep the DKK 100 for him/herself. You can reduce the earnings of the proposer by DKK 5 by giving up DKK 1 of your own earnings. That is, if you give up DKK X of your own earnings, you reduce the earnings of the proposer by DKK 5\*X. How much of your own earnings are you willing to give up to reduce the earnings of the proposer? Remember that you and the other participant will actually be paid according to your decisions if the computer draws your names.


You have now completed the first part of the survey. The next part consists of three questions, where you are to write your answer in the box below the question. Your chances of getting paid for this part depend on how many questions you answer correctly. For each correct answer, one lottery ticket with your name will be added to the pool from which the computer will draw one participant, who will be paid DKK 100.

Q7: A bat and a ball cost \$1.10. The bat costs \$1.00 more than the ball. How much does the ball cost? (Write your answer in cents) Remember, a correct answer increases your chances of getting paid DKK 100.

Q8: If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets? (Write your answer in minutes) Remember, a correct answer increases your chances of getting paid DKK 100.

Q9: In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake? (Write your answer in days) Remember, a correct answer increases your chances of getting paid DKK 100.

Q10: Please indicate your gender.

*Games* **2020**, *11*, 21


Q11: At which faculty do you study?


Q12: Please write your email-address (studynumber@post.au.dk) The email address is to pay a participant who is drawn to receive his/her earnings in the survey. You are not required to provide your email address, but you cannot get paid if you do not.

Thank you for participating. You will be notified by email if you are drawn to be paid.
