新经济政策
Nikolai Dmitriyevich Kondratiev (; also Kondratieff; Russian: Никола́й Дми́триевич Кондра́тьев; 4 March 1892 – 17 September 1938) was a Russian Soviet economist and proponent of the New Economic Policy (NEP) best known for the business cycle theory known as Kondratiev waves.