 A legal doctrine that aims to protect clients is so-called fiduciary duty, which imposes obligations on fiduciaries (those entrusted with others’ money) to act in the sole interest of beneficiaries (those who own the money). The interests referred to are typically taken to be financial interests, so the obligation of the fiduciary is basically to maximize investment returns. But some argue that there are cases in which beneficiaries’ broader interests should take precedence, such as when investing in fossil fuels may give high financial returns but pose serious risks to people’s future (Lydenberg 2014; Sandberg 2013, 2016). In any case, it is often thought that fiduciary duties go beyond the ideal of a free market to instead give stronger protection to the weaker party of a fragile relationship.