However, the resulting linguistic situation can plausibly be regarded as unjust in three distinct senses. Firstly, the adoption of one natural language as the lingua franca implies that its native speakers are getting a free ride by benefiting costlessly from the learning effort of others. Secondly, they gain greater opportunities as a result of competence in their native language becoming a more valuable asset. And thirdly the privilege systematically given to one language fails to show equal respect for the various languages with which different portions of the population concerned identify. Linguistic Justice for Europe and for the World spells out the corresponding interpretations of linguistic justice as cooperative justice, distributive justice and parity of esteem, respectively. And it discusses systematically a wide range of policies that might help achieve linguistic justice in these three senses, from a linguistic tax on Anglophone countries to the banning of dubbing or the linguistic territoriality principle.

Against this background, the book argues that linguistic diversity is not valuable in itself but it will nonetheless need to be protected as a by-product of the pursuit of linguistic diversity as parity of esteem.