By Sheri Berman • Several of Europe’s centre-left parties have suffered disappointing election results since the financial crisis, but is this slide in support permanent or can they arrest their decline? Sheri Berman writes that with the rise of new parties on the populist right, the centre-left risks sliding into irrelevance unless it can respond with viable and attractive solutions to contemporary problems. Europe today is in crisis. Economically, much of the continent suffers from low growth, high unemployment and rising inequality, while politically, disillusionment with the European community as well as domestic institutions and elites is widespread. Partially as a result, right-wing populism is growing, increasing political instability and uncertainty even further. Although many have noted a correlation between the rise of populism and the decline of the social democratic or centre-left, the causal relationship between them has not been sufficiently stressed. Indeed, to a large degree the failures...