“…Empirical studies of the effects of supermajority requirements on taxes indeed indicate that there is a negative effect (Knight, 2000; see also Crain and Miller, 1990;Gradstein, 1999;Kenyon and Benker, 1984). Krugman's (2009) argument, however, extends further and connects the adoption of supermajority requirements, and the consequences of it, to the state political trends (see also Alt and Lowry, 1994;Knight, 2000;Qiao, 2006). Obviously, if it takes two-thirds majority instead of simple majority to pass legislation it would be more difficult to do so, but this is not an insurmountable problem if there is a culture of political bipartisanship (Qiao, 2006, p. 288).…”