Doanaldin Trumpet, the first female president of the Corporate States of America, has passed a revolutionary bill called the D.E.D (despicable exploitation of the dead) act. This allows employers advantages in society never before seen in our nations history. All future employees wanting to gain employment in any company must sign a waiver allowing their corpses to be resurrected by their employer. By paying a considerable fee, a corporation can hire a necromancer to bring back a dead worker as a form of undead. These zombies are fully intelligent and retain their memories of life, as well as any skills or knowledge they may have developed.
The resurrection process returns their youthful vigor, e.g. by regenerating their mitochondria, such that the resurrectee could potentially outshine any living employee by many orders of magnitude. This way, the worker continues to serve his company in life and death. However, upkeep of the body is still expensive, giving a necromancer continued value. The ritual thst brought them back must be repeated at various times to maintain their unseat and prevent them from decaying.
How can I make this system more profitable and appealing for an employer over training someone new to do the same job?