Why does the system in which the "Supreme Guide" has absolute power, needs a president or even a prime minister. The answer is simple: despotic systems need to keep alive the possibility of change. In the old times, the potentates would calm down rebellious spirits by rotating the viziers according to the mood of the moment. In modern despotic systems, such as that created by Stalin in Russia, changes in the administrative personnel were used to nurture the myths of " hawks and doves." For example, people inside and outside the Soviet Union thought that Malenkov was more "liberal" than Stalin and Khrushchev more lenient than Malenkov. A whole industry of Kremlin-watchers was built around that conceit.