The 1973-87 authoritarianism rise came from Lows disappearing and moderate Highs multiplying.

Evidence

How? The rise occurred basically because the low end of the RWA Scale distribution (in absolute terms) wilted and died. (“Where have all the flowers gone?”’) At the same time, the number of “slightly” and “moderately” High RWA students increased (EOF, pp. 24-27). (“Gone to business school, every one.”) — Bob Altemeyer, The Authoritarian Specter, 1153