In contrast to the Supreme Court, which typically reverses the cases it hears, the United States Courts of Appeals almost always affirm the cases that they hear. We set out to explore this affirmance effect on the U.S. Courts of Appeal by using insights drawn from law and economics (i.e., selection theory), political science (i.e., attitudinal theory and new institutionalism), and cognitive psychology (i.e., heuristics and biases, including the status quo and omission biases).