We present an overview of the evidence regarding the unitary, collective and noncooperative models of household decision making and discuss how they can affect individual and household welfare. We then discuss the results of an artefactual experiment conducted in Uganda with spouses in order to test whether household members maximize common preferences, or instead are willing to pay a significant cost to hide money from their spouse. We find that both the unitary and non-cooperative models exist in the intra-household decision making process and that a “one-size fits all” model of household decision making is unlikely to be satisfactory.