what allowed people to have different jobs

Question

is it business class i think thats the answer but i don't no 

Answer 1

I have edited your questions for better English usage:  Is it business class? I think that's the answer but I don't KNOW.

 

The development of society from the feudal model when peasants and their descendants remained peasants created trades and business and the need for staff, so that upward mobility came into existence.