E-nstructions facilitates the use of electronic instructions in computerized laboratory ex-periments in social sciences. In this article I provide a set of guidelines for the installationand the use of E-nstructions.

How do people make investment decisions when they receive outcome feedback? We examinedhow well the standard mean-variance model and two reinforcement models predict people’sportfolio decisions. The basic reinforcement model predicts a learning process that relies solelyon the portfolio’s...