Visual Convex Time Preferences

Lab: All subjects played the MPL and the VCTP.

• T1: Half of them MPL --> VCTP (n=77)

• T2: The other half VCTP--> MPL (n=74)

• Random assignment to T1 or T2

• There is a second sub-treatment (real incentives vs hypothetical vs 1/10 real payments) random assignment:

  • 1/3 of T1 and T2 used real incentives

  • 1/3 of T1 and T2 used hypothetical incentives

  • 1/3 of T1 and T2 used 1/10 real incentives

Field: All subjects played the MPL and the VCTP.

• T1: Half of them MPL --> VCTP (n=157)

• T2: The other half VCTP--> MPL (n=172)

• Random assignment to T1 or T2

• There is a second sub-treatment (10 vs. 5 balls)x(self-managed vs enumerators) random assignment:

  • 1/4 of T1 and T2 used 10 balls (coins) to make decisions, instructions were self-managed

  • 1/4 of T1 and T2 used 5 balls (coins) to make decisions, instructions were self-managed

  • 1/4 of T1 and T2 used 10 balls (coins) to make decisions, instructions were explained by enumerators

  • 1/4 of T1 and T2 used 5 balls (coins) to make decisions, instructions were explained by enumerators

High Schools: Played either MPL or VCTP (between-subjects design)

• T1: Half of them MPL (n=212)

• T2: The other half VCTP (n=234)

• Random assignment to T1 or T2

Lab: Standard subject pool. Volunteers from the School of Economics and Business of the Universidad de Sevilla in late May 2019.

Field: A local consultancy firm at Honduras (PILARH) was hired to run the experiment as part of a larger World Bank project. We chose eight primary schools and randomly se- lected households from their listing to recruit our experimental population.

High Schools: We contacted teachers at several schools in Cordoba, Sevilla and Cadiz. Participants are students from these courses (invited by their teachers) who voluntarily decided to participante, most of them online.

There is a unique zip file containing all the materials: link here.

Lab: Instructions in English and original in Spanish.

Field: Instructions in English and original in Spanish.

High Schools: Instructions in English and original in Spanish.