Power to lower classes

Buffer stocks of employed people works better than buffer stocks of unemployed people because it's easier to move workers in and out of private sector employment when the workers are always working than when they become completely unemployed and have to qualify themselves to prospective employers from a condition of not being able to demonstrate bona fides and skills the way employed people can. 

This is not so different from an economy that periodically puts into power the lower classes and thus considers it a good investment to have the lower classes acquire effective management skills.