Shachar, Ayelet Ethics, Law and Politics, MPI for the Study of Religious and Ethnic Diversity, Max Planck Society;
https://www.ethicsandinternationalaffairs.org/2018/marketization-citizenship-age-restrictionism/ (Any fulltext)
Shachar, A. (2018). The marketization of citizenship in an age of restrictionism. Ethics & International Affairs, 32(1), 3-13. doi:10.1017/S0892679418000059.