Noted developmental psychologist jean piaget based his theory in large part on in-depth examinations of his own three children. piaget's work exemplifies the research method.

Piaget's work exemplifies the 'experimental method’ research method. The Piaget's ‘experimental method’ had three steps:

hypothesis testing

strict control of experimental variables

treatment of data with specifically designed statistical procedures.

Piaget's early methodology has been often criticised for many different reasons, and among them was the fact that the methodology was observational rather than experimental. Piaget's ‘experimental method’ later developed and became known as the ‘clinical method’.

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .