Why was the nep abandoned?

The New Economic Policy (NEP) was abandoned in the Soviet Union primarily due to ideological shifts within the Communist Party. By the late 1920s, leaders like Joseph Stalin viewed the NEP as a compromise with capitalism that hindered the goal of rapid industrialization and collectivization. The desire for a more centralized economy and the push for a socialist society led to the introduction of the First Five-Year Plan in 1928, marking a departure from the NEP's mixed economy approach.