We show that exposure to market relationships increases people's tendency to make utilitarian moral choices by means of proportional thinking-the definitional feature of the market mindset. In Experiment 1, participants primed with market relationships made more utilitarian choices in both the trolley and the footbridge dilemmas. In Experiment 2, priming market mindset led to more utilitarian moral choices and to greater focus on the proportion of survivors to victims. Experiment 3 showed that the effect of market mindset on utilitarian choices held only when the numbers of potential deaths and saved lives were clearly specified. A preregistered Experiment 4 demonstrated that the motivation to use proportional thinking mediates the relationship between market mindset and making utilitarian choices. Experiment 5, also preregistered, showed that the main effect we demonstrated is not due to suppressed emotions and that proportional thinking increases utilitarian choices as part of a broader orientation on rationality. K E Y W O R D S market mindset, moral choices, proportional thinking, utilitarian choices | 1501 MARKET MINDSET IMPACTS MORAL DECISIONS directed towards calculating and acting in accord with ratios or rates (Fiske, 2004; Rai & Fiske, 2011). 1.1 | Moral judgment and choice: Utilitarianism versus deontology When investigating moral judgment and decision-making, both philosophy and psychology often refer to the dual-process approach (Greene, 2007, 2014). This framework differentiates between deontology, which states that morality of an action depends on the intrinsic nature of human actions regardless of their consequences (Kant, 1785/1959) and utilitarianism or consequentialism, which implies that morality of different actions is determined by their outcomes (Mill, 1861/1998). Proponents of the utilitarian position argue that moral decision-making should always lead to the best overall consequences for all concerned (Conway, Goldstein-Greenwood, Polacek, & Greene, 2018). Even though the tension between these two approaches has, for many years, been at the heart of the philosophical debate, it is also of great importance from the standpoint of social psychology (Bartels, 2008; Greene, 2007). It concerns not only rather abstract and rare dilemmas such as whether to kill one person in order to save several others (Thomson, 1976), but also more practical, daily-life problems such as whether to fire a small group of workers during a recession to lower costs and save jobs for a larger group of employees. Several years ago, Greene, Sommerville, Nystrom, Darley, and Cohen (2001) proposed a theoretical model that aimed to explain why, in some situations, people employ deontological reasoning, while in others they turn towards the utilitarian orientation (see