What is striking from our field investigations in Benin is that husbands and wives are secretive with respect to income matters. They actively avoid sharing information about their personal earnings and thus do not have a common budget. (p. 47).
That is from this paper by Philippe Lemay-Boucher & Olivier Dagnelie. That behavior has also been observed in other societies in Africa For the authors the policy implication, given certain government objectives, is to transfer money directly to women!