We analyse the liberal ethics of non-interference applied to social choice. Two liberal principles capturing non-interfering views of society, inspired by J.S. Mill's conception of liberty are examined, which capture the idea that society should not penalise agents after changes in their...

In the context of the two-stage threshold model of decision making, with the agent's choices determined by the interaction of three "structural variables," we study the restrictions on behavior that arise when one or more variables are exogenously known. Our results supply necessary and...

Classical definitions of complementarity are based on cross price elasticities, and so they do not apply, for example, when goods are free. This context includes many relevant cases such as online newspapers and public attractions. We look for a complementarity notion that does not rely on price...