What is the freezing party system?
Actually it's the "freezing of party systems". Famous concept of Norwegian political scientist Stein Rokkan. Basicaly, on the base of his extended research in West-European political szstems he found out that the party systems and the cleavagesvhas not changed since they emerged (national and industrial revolutions) till his days in the 60s. They froze. There were noe new parties, no new topics. After this period there was the unfreezing of party systems, when new (mainly) postmodern topics emerged, therefore there were new parties and also the voters stopped to be so closely devoted in "their" parties. Since the 60s the party systems has been coming through changes again.