Marx he uses the scientific method on his work and is well-known that the greatest Marxists always had great broad view of the economy

Marx literary dissected the capitalist system

Lenin used the understanding of capital intrusion on Russia to form the politic of alliance of workers and peasants

the trotskyists foresee the scissors' crisis and the Russian industrialization was a trotskyist plan

a true Marxist economic analysis must be scientific and the ones who fllowed that was showed to be extremely consistent throughout history