Shareholder primacy is the most fundamental concept in corporate law and corporate governance. It is widely embraced in the business, legal, and academic communities. Economic analysis and policy arguments advance a normative theory that corporate managers should maximize shareholder wealth....

We study the equilibrium effects of the "S" dimension of ESG under imperfect competition in labor or product markets. We model ESG policies as constraints that boards place on managers to treat their stakeholders well. "Doing Well by Doing Good" holds for moderate ESG policies, which are...