 When Eden resigned in 1957 following the Suez Crisis, Macmillan succeeded him as Prime Minister and Leader of the Conservative Party.As a One Nation Tory of the Disraelian tradition, haunted by memories of the Great Depression, he believed in the post-war settlement and the necessity of a mixed economy, championing a Keynesian strategy of public investment to maintain demand and pursuing corporatist policies to develop the domestic market as the engine of growth.Benefiting from favourable international conditions, he presided over an age of affluence, marked by low unemployment and high—if uneven—growth.