Economically, the Left Opposition and its theoretician Yevgeni Preobrazhensky came out against further development of capitalist elements in the Soviet economy and in favour of faster industrialisation. That put them at odds with Bukharin and Rykov, the "Right" group within the Party, who supported the "troika" at the time. On the question of world revolution, Trotsky and Karl Radek saw a period of stability in Europe while Stalin and Zinoviev confidently predicted an "acceleration" of revolution in Western Europe in 1924. On the theoretical plane, Trotsky remained committed to the Bolshevik idea that the Soviet Union could not create a true socialist society in the absence of the world revolution, while Stalin gradually came up with a policy of building 'Socialism in One Country'. These ideological divisions provided much of the intellectual basis for the political divide between Trotsky and the Left Opposition on the one hand and Stalin and his allies on the other.