The subjective scope of voluntary improvements in Social Security: unequal treatment between workers. Comment on Supreme Court Ruling 877/2022, of 31 October (appeal 50/2019). revsegsoc [Internet]. 2023 Sep. 29 [cited 2026 Nov. 6];(36):125-30. Available from: https://revista.laborum.es/index.php/revsegsoc/article/view/727