so, we get a sort of vicious circle: in order to raise productivity of labour we must save ourselves from starvation, and in order to save ourselves from starvation we must raise productivity of labour.

This is all lower case. Can you fix that?
So, we get a sort of vicious circle: in order to raise productivity of labour we must save ourselves from starvation, and in order to save ourselves from starvation we must raise productivity of labour.