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A randomised control trial was conducted to determine changes in the food and drink choices of adolescents following their participation in a 50-min nutrition workshop. The experiment was conducted at 104 schools in Barcelona (126 classes, 3,291 adolescents). Schools were randomly selected and stratified by district and by public or private status. The students were given three types of vouchers with different options regarding the type of food for which the vouchers could be exchanged (standard for healthy food and drink, two for one for unhealthy food, and two for one for unhealthy drink). Difference-in-differences linear models that control for individual, family, school or neighbourhood characteristics, and the influence of peers were applied. The probability of students' choosing unhealthy food and drink fell by 7.1% and 4.4%, respectively, following participation in the nutrition workshop. The promotion of unhealthy beverages counteracted the positive impact of the workshop on beverage choice., (Copyright © 2017 The Authors. Health Economics published by John Wiley & Sons Ltd.)

In Spain's 'MIR' system, medical school graduates are ranked by their performance on a national exam and then sequentially choose from the available residency training positions. We took advantage of a unique survey of participants in the 2012 annual MIR cycle to analyze preferences under two different choice scenarios: the residency program actually chosen by each participant when it came her turn (the 'real') and the program that she would have chosen if all residency training programs had been available (the 'counterfactual'). Utilizing conditional logit models with random coefficients, we found significant differences in medical graduates' preferences between the two scenarios, particularly with respect to three specialty attributes: work hours/lifestyle, prestige among colleagues, and annual remuneration. In the counterfactual world, these attributes were valued preferentially by those nearer to the top, while in the real world, they were valued preferentially by graduates nearer to the bottom of the national ranking. Medical graduates' specialty preferences, which we conclude, are not intrinsically stable but depend critically on the 'rules of the game'. The MIR assignment system, by restricting choice, effectively creates an externality in which those at the bottom, who have fewer choices, want what those at the top already have. Copyright © 2016 John Wiley & Sons, Ltd., (Copyright © 2016 John Wiley & Sons, Ltd.)