They each got what they wanted — neither owes the other anything.
Tips
usage
Used two ways: (1) neutral — buffets, free selection, marketplaces (each picks what suits them); (2) mildly critical — transactional relationships where both sides are just extracting what they want without genuine connection. Context disambiguates.
culture
Echoes the Marxist slogan 各尽所能,按需分配 ('from each according to ability, to each according to need'), though 各取所需 predates it and is now usually neutral-commercial rather than political.