That's not accurate: the Swedish Academy only selects the Literature prize. The medicine prize is selected by the Karolinska Institute and the physics/chemistry

That's not accurate: the Swedish Academy only selects the Literature prize. The medicine prize is selected by the Karolinska Institute and the physics/chemistry/economics prizes are selected by the Royal Swedish Academy of Sciences (which is an entirely different organization from "the Swedish Academy"). Technically, non of these organizations "award" the prizes, the prizes are awarded by the Nobel Foundation and the Swedish National Bank, the Riksbank (only the economics prize). They just select the winners.