For many decades, there has been a debate about the relation between corporate social/environmental performance (CSP) and corporate financial performance (CFP). Our study presents a review of academic research on this topic by applying a second-order meta-analysis. The data sample combines 25 previous meta-analyses yielding a sample size of one million observations. Our results demonstrate a highly significant, positive, robust, and bilateral CSP-CFP relation. The relation is positive regardless of whether firms focus on ecological or social aspects, though corporate reputation turns out to be a key CSP determinant. We find a particularly strong CSP-CFP relation for operational CFP. Furthermore, we add a new perspective on potential biases resulting from the studies’ publishing source: social issues-oriented journals and methodological weaker papers do not distort the positive CSP-CFP relation. Our conclusion is: Based on the extant literature, the business case for being a good firm is undeniable.