Alderfer differs from Maslow in that his ERG theory assumes
◦ a rigid hierarchy of needs exists.
◦ a lower level need must be gratified before a less concrete need becomes operative.
◦ if higher level needs are strong but ungratified, individuals will increase their desire for the gratification of lower level needs.
◦ growth needs can be completely satisfied just as existence and relatedness needs can be.
◦ the least concrete needs become more desired as they are fulfilled.