Three essays in choice and social choice theory

This thesis is composed of one essay in Choice Theory and two in Social Choice Theory and considers situations where an issue has arisen with a number of ways to deal with it. Chapter 1 studies how the choice of an individual adhering to specific ways of dealing with the issue, affects his preferences on the issue itself. Chapters 2 and 3 study how the choice of a group of individuals (who might have different preferences on the issue) adhering to specific ways of dealing with the issue, affects the aggregation of the individuals' preferences that leads to the group's choice.