- argue that all societies need a way of placing individuals into the different roles or social positions that must be filled - role allocation
- some roles are functionally more important than others
- most people lack talent to fill functionally important roles or the motivation to train for them
- these important roles have high pay and high status because of this
- stratification is necessary for society to ensure talented people train for and fill most important jobs
- societies need some degree of inequality built into them
- many jobs that are vital to society have low pay, or low status
- group's high pay and status may be linked to power instead