The figure below shows the relationship of the quantity demanded for iTune music downloads per day to the price of each iTune music download. 
Definitions:
Adjustment Problems
Difficulties in coping or adapting to new, changing, or challenging environments, often leading to psychological distress or disorders.
Sibling Fighting
involves conflicts and physical or verbal altercations between siblings, which is a common aspect of sibling dynamics.
Parental Fighting
Conflicts and arguments that occur between parents or guardians, often impacting the emotional and psychological well-being of children.
Birth Spacing
The practice of waiting a certain period of time between giving birth and becoming pregnant again, considered important for the health of both mother and child.
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