By building upon cascades literature, the author offers an explanation for
rapid and massive polarization and applies it to the former Yugoslavia. The
dominant images of ethnic categories in society change through cascades of
individual reactions triggered by traumatic events, ideological shifts, or
the activities of ethnic entrepreneurs. Polarization becomes self-propagat
ing if the protagonists of a certain image of ethnic identities, called the
divisive image, appear to have reached a critical mass. Downward ethnic pr
eference falsification, people's concealment of their support for the divis
ive image in public, increases the severity of polarization. The article ar
gues that downward falsification was significant in Yugoslavia before the 1
980s due to policies that suppressed the public expression of the divisive
image but insufficiently encouraged its elimination in private. In the 1980
s, polarization reversed this trend and led to widespread upward ethnic pre
ference falsification, the exaggeration of the support for the divisive ima
ge in public.