Opinions on hard-to-discuss topics change more via cohort replacement

Cohort replacement - the replacement in a population of older cohorts by their successors who developed under different conditions - is an important process behind cultural change. Research on public opinion indicates that a large proportion of aggregate change is the result of cohort replacement rather than of individuals changing their minds. However, some publicly salient issues, like gay rights, appear to be exceptions. Why different issues show different patterns of change is not well understood. In this paper, we investigate whether opinions on sensitive - that is, hard to discuss - issues might change differently than opinions on less sensitive issues. We use data from the 1981-2020 World Values Surveys and newly collected data on the sensitivity of survey items to compare aggregate changes in public opinion on 56 survey items in eight countries. Our key finding is that survey items on more sensitive issues seem to change more through cohort replacement.