“…Not only do executives differ from other elites, but heads of state and heads of government differ markedly from each other in their mandates and key authorities. Although considerable effort has gone into measuring presidential powers (Frye, 1997; Metcalf, 2000; Shugart & Carey, 1992; Siaroff, 2003) and showing that such powers influence outcomes (e.g., Andrews & Bairett, 2014b; Samuels & Shugart, 2010), a potential danger of coding only presidential strength is assuming that prime ministers are functionally equivalent across political systems and that their powers are unrelated to outcomes. Bergman, Müller, Strøm, and Blomgren (2003) show that parliamentary systems do vary considerably, and that political accountability varies as a result.…”