ABSTRACT
This chapter focuses on Amartya Sen’s social choice theorem stating the impossibility of a Paretian liberal. It explains how the theorem can be applied to planning problems involving privacy. Despite extensive discussion of the liberal paradox, the social choice literature contains very few examples of interest to planners. A group of drivers suffering from the toll may then be decisive in the social choice between a transport plan based on the toll road without a free alternative and a plan solving the capacity problem without road tolls. The chapter shows that privacy is a concern with a number of the measures applied or proposed for use in transport planning practice. Electronic devices facilitating registration, data processing, and pooling of registers are a threat to privacy. The outcome of trying to satisfy privacy-rights and preference sovereignty simultaneously can be oscillation between the conflicting planning options, that is, a decision cycle.
