During the 1980s, the Fourth Labour Government under Prime Minister David Lange and Finance Minister Roger Douglas implemented several neoliberal economic reforms known as Rogernomics which transitioned New Zealand's Keynesian economy towards a more free market model. Labour's abandonment of its traditional values fractured the party, leading disaffected members to join Jim Anderton's NewLabour Party, Greens, New Zealand Democratic Party for Social Credit, and the Mana Motuhake parties under the Alliance. Successive Labour governments have promoted centre-left social and economic policies while preserving a free market economy. The Prime Minister Jacinda Ardern identifies as a social democrat and formerly served as President of the International Union of Socialist Youth.