“…Bidding up the political costs of backing down from a threat (Fearon, 1994; Schultz, 1998) or expending resources on military mobilization (Lai, 2004; Slantchev, 2005) can distinguish those states willing to fight from bluffers. Yet fully separating threats appear to go unmade even when they are available (Fearon, 1997; Russett, 1963); leaders infrequently stake their political survival on crisis outcomes or engage in substantial military mobilizations (see Sechser, 2010; Snyder and Diesing, 1977; Snyder and Borghard, 2011), instead making ‘halfhearted’ or ‘watered-down’ threats that fail to clarify an ultimate willingness to fight (Byman and Waxman, 2002; Papayoanou, 1997; Wolford, 2014b). But why would a state that truly is willing to fight make an ambiguous threat when a credible one is available?…”