Maximum average cost of shower pans: $700. Minimum average cost of shower pans: $200. Shower pans vary in cost primarily based on their size, the material used in their construction and any applicable warranty they might carry. Larger shower pans are invariably more expensive.
Behaviour operates on the environment to bring about favorable consequences or avoid adverse ones. These same ideas of operant conditioning can also be applied to language acquisition because Skinner believed that language could be treated like any other kind of cognitive behaviour. According to the behaviourist theory, language learning is a process of habit formation that involves a period of trial and error where the child tries and fails to use correct language until it succeeds.
Language development is one of the hallmarks of this period. Piaget noted that children in this stage do not yet understand concrete logic, cannot mentally manipulate information, and are unable to take the point of view of other people, which he termed egocentrism.