sociology help pleaseWatch
Davis & Moore is more simple as they only really appear in Education (as I have seen so far):
Those who perform the difficult tasks are therefore entitled to more power, prestige, and money. Davis and Moore believed that an unequal distribution of society’s rewards is necessary to encourage people to take on the more complicated and important work that required many years of training. They believed that the rewards attached to a particular job reflect its importance to society.
As for Blau, on education (I don't recall him being mentioned in other topics):
Peter Blau and Otis Duncan (1971) argue that a modern economy depends for its prosperity on using its "human capital" - its workers' skills. They argue that a meritocratic education system does the best, since it enables each person to be allocated to the job best suited to their abilities. This will make most effective use of their talents and maximise their productivity.
Is there any part in particular that's confusing you about the theories/sociologists, or is it a matter of retaining knowledge?