Under what is arguably the single most dominant approach in modern economic theory, to act rationally is to act in accordance with one’s self-interest, and it is only “rationality as self-interest” that explains behavior in the market sphere. Many economists attribute this idea to Adam Smith, often referred to as the “father of economics.” Yet, in his The Theory of Moral Sentiments, Smith expands the notion of rationality to reasonableness, or the standards one has reason to value and act on, and includes in this concept both self-interested virtues, such as prudence, and other regarding virtues, such as beneficence. Other academics, such as Elizabeth Anderson, have followed Smith’s lead in expanding the notion of rationality to include val...